I want 500+ games on steam

Yeah, you can buy most of the games.

There's a few sites that sell nice bundles for generally a small amount of money, they are:
HumbleBundle
Fanatical
IndieGala
DailyIndieGame

Steam's summer sale event launches in 4 days. You can buy games at reasonable prices while getting free trading cards for the uncapped event badge to level up and Steam points to pimp your profile.

Tremor Games were good for that but unfortunately they closed a few years back. I understand the site had plenty of problems so i guess it is understandable.

I'm not someone who cares about boosting my game count, but the other day I stumbled across this site (Steamground) that sells packs of 50/100 random games.

I can't personally vouch for them. Could be a scam.

Also, in the description it says:

4. Most of the games don't add +1 to game collector count  

So might not be what you're looking for.

There are some free ways
IndieGala Gameplay Giveaway :
You can win easily 2 games per day
You can find more here: https://www.steamgifts.com/discussion/fzysu/indiegala-gameplay-giveaway

LootBoy:
https://www.steamgifts.com/discussion/rSWOI/lootboy-codes-for-coinsdiamonds

If you want good games, you'll get there eventually. If you just want the 500+ badge, there are plenty of 1 dollar "games" on Steam.

Have you played the Indiegala gameplay giveaway? You can reasonably get atleast 2 keys a day or 3 if you're really good/lucky with the minigame!

There are also quite a few permanently free games on steam that give a +1 game count if you search for the list either on here or google/reddit, plus steam sometimes gives random games for free for a few days! There's an app to give you a notification for it, reddit groups (FreeGameFindings) or discord bots you can add to your own personal server!

Be careful which games you buy if you're only interested in the +1, cause many are profile limited and won't give you a game count.

Humble is good and so is Fanatical! I think a lot of games from the DailyIndieGame and Indiegala bundles seem to be profile limited.

If you have extra games you could also trade them with people like on steamtrades or barter!

Some free game add +1

I'm curious, why would one want to just collect game numbers?

Trading is another way to get lots of games, assuming you have game keys to trade. You can try steamtrades.com or barter.vg (much better imo).

Like, you are level 76. So obviously you are doing something right if your goal is to level up.
In case of increasing number of owned games, just buy bundles from humble, fanatical, gmg etc. Anything works.

Since trading and trading-related discussions here are not allowed, I suggest you to simply add me for further suggestions

Why? Do you need more games so you can keep cheating achievements?

Don't ask me, i almost gave 500 away more then i won.

But no, you can buy cheap keys from keyresellers, check the sellers rating though cause there is always a chance you can get burned (often you get your money back though from such sites) i can't name anything because of the rules here.

I don't recommend piling up games just for the sake of having an impressive number. Sooner or later you'll realize that sitting on a pile of trash is hardly a prestigious affair. Quite the opposite.

Waste of time.

I've gotten the amount of games i got by buying bundles overtime and sometimes cheap deals, very rarely pay high prices for games unless it is something i really want to play.

So if you want more games, buy bundles, people here suggested some stores already, there used to be more in the past, but competition sometimes does these things.

But i can tell you, you are wasting your time with meaningless stuff. Focus on playing games you want to play, as time goes on, you will get cards, badges, etc. Then slowly change your profile as you see fit. You could however learn how to customize your profile on a professional level by making it unique and stand out, instead of focusing on levels/badges. A good profile that stands out can blow away the mind of visitors and even attract people towards your profile. Everything else is "meh" and nothing special really. Game count means nothing these days because bundles exist, third party resellers exist, official 90% bundles exist, lots of free games given away, etc. Gaming industry is bloated, so the value of games has gone down, along with the quality of it as corporations fight each other to get to your wallet first.

I've said all this because i thought like you in the past, like a decade ago, when i got my first job, i was like "OMG MUST GET 100+ GAMES ON STEAM", i only had valve games at the time and like 5 non valve games, so i started buying other things like borderlands, terraria, etc... By the time i got 200 games, bundles came about, bought bundles until i got around 1.5k games and decided to stop buying them for some years (like 5 or so), i got back to buying some bundles in the last 2 years and eventually got to 2k. Basically got over 500 games in 2-3 years and i did not buy all bundles, only bought those that had games i was interested in, still a waste of time and money because at best, i beat 1 game per week average and i usually add more games than what i beat to the backlog. Getting freebies also increases the count by a good amount.

I don't know if this goes for everyone but for me having a huge pile of unplayed games is a source of stress more than a thing I'm proud of, even if it's nice to have options about what to play next there's a point at which having too many options is just overwhelming and requires me to just stop playing games for a while. Don't turn this hobby into a grind.
That said, I'm absolutely guilty of jumping at almost any opportunity to get a new entry in my library, as I said it's just nice to have options and if I had the willpower and opportunity I'd probably play a lot more than I do. To me the way to accrue thousands of games was simply to buy a bunch of bundles (this is the main one), steam sales, giveaways both in here and other places, and of course to grab every freebie I became aware of (as long as I was able and willing to jump through the required hoops to get it).

whats nivq services???

I used to easily boost my level from big events than game cards. I believe it's still worth it to do it like that today, but I've stopped caring that much.

Buy bundles, trade keys you don't want for those that you do want, buy games with big discounts, buy beta/review/bundled keys from grey market sites, buy "Complete your collection" packages on Steam. Also you are on a site where people give away games, you can enter some giveaways and try to win free games. You could also just buy a bunch of crap and get up to 500 games but it sucks to have crap in your library, and the more crap that's in there the worse it is to deal with.

You're about to enter in the gaming paradox. If you work enough to get money to buy games, you won't have enough time to play them...

I'm here (steamgifts) for 9 years and I won almost 500 games already. So I would say that you made first step by registering here, now just wait enough time xD
But seriously - If you don't care about quality - buy fanatical's 1$ bundle xD

more games is not really going to help, it won't give you any wallpaper or icons that are nice to look at