Any idea how to remove this red alert I got on steam ?

They might have flagged it because of the Gamvio one.

Where did the $250 gift cards come from and how many?

If it was more than 4 or more it might simply be the case of excessive use so Steam has flagged you as a possible scammer (ones who email people saying "Yo it's ya boss, I need you to buy me a Steam Card and send me the code" ... seriously it's a thing.

Were the gift cards meant for your region, or did you try to get a discount by buying cheaper ones with a higher value?

Well, there's not much we can help with, you didn't give much information on where you got all the steam gift cards (I think that the more important information is where you got the 250 dollars rather than some 10 dollars from gamivo), so we can't do much.
Only thing you can really do is what it already told you to - contact steam support.

Only Steam can help you with this problem.
Because they wrote the lock (market and key activation) is PERMANENT and they will not answer further questions etc. to this case, i would say none can do something.

Where did the $250 gift cards came from ?
In which currency ?
Are your steam shop listed in the correct country or are you tried to buy in a cheap country but you are normaly in a other (more expensive) one ?

EDIT: And you wrote that you have 700+ games, when i checked your steam account (the one that is connected with your sg account) it shows 13 owned games.
So it is clearly not the account you speak from and you hide the name in the screenshot. Normaly understandable when the name shows a login name that is different written as the steam name that is shown for the public -i do the same because of security reasons- but in combination with the other used account for sg, to question, it looks shady.

What's your main account?
And why are people saying you're a scammer? => https://www.steamtrades.com/user/76561199207413768
Could it be related to you selling gamekeys via Reddit under different accounts? => https://www.reddit.com/user/MrGadgetGuy/, https://www.reddit.com/user/Medical-Falcon5584/
Are you using the PayPal credit you earned by selling game keys for buying gift cards to your main account?

In other words: Good riddance! Well deserved ban.

UTGamer0501
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I have bought the giftcards from gamivo I have brought various games and giftcards from gamivo but never got any problem earlier.
Also what to do if steam has flagged me for giftcards ?
What to write to customer support to unlock it ?
All help and advice are much appreciated

This all sounds fishy as heck, I've been trading for a long time and I never usually see anyone trade games for gift cards, especially for the more expensive trades, not unless they were trying to avoid a chargeback. In the future I'd recommend being more open and clear about your trades, e.g. State your price for everyone to see alongside the payment method you want to use.

Steam doesn't usually ban people straight up without having definitive proof you fucked up, my best guess if this really is innocent is that some of the gift cards you bought were stolen and with you adding so many at the same time, it doesn't exactly look great. Next time just add funds directly to your Steam account, if you ever get it back.

Hey UTGamer0501. please try to contact the steam support to understand what's happened to you and why?
and try to elaborate your situation to them not us. We all are like you we can do nothing, so try to collect all the things that you can present before them to excuse it.
Hope all will be good soon.

You can ask the cause to Steam support, though know that these alerts rarely go false positive. So it's more likely you actually violated Steam ToS.

Also, would you fill in the blanks, I'm trying something.

kor--ma sön--z bu şaf-----da yü--n al san---.
---dır y--iğin h--malar --lir ---ünü t--malar.

My guess is Credit Card fraud was used to buy the Gift Cards and then anyone activating those are banned. Entirely sensibly.

And this is why you don't buy gift cards from key websites, or such places.

i don't understand who buys £250 gift cards at once and then expects them (Steam) to think this is normal

As a heads up to OP -
Gamivo has the potential to host unknown scammers with codes or keys of unverified origin.

I mean there is always ways to settle things,but w/o coming cleaner over the table ,i dont think anyone is willing to help ,because ,man youre looking way to "sus" right now .
Even that you got a scam complaint at the same day your acc got banned