Improving my Wi-Fi using an amplifier, yeah or nah?

Ethernet cable would be ugly, if you can't hide it, but I've been rolling with it for years now and can't complain. Had 10 meters in my old place and my current cable is 4 meters. Those aren't expensive either. In stores, yes, ridiculously overpriced but on the internet (amazon) you can get them dirtcheap.
How good the signal will go through walls kinda depends on the building, I guess? I wouldn't take the risk, unless you're fine with getting a refund and all that annoying shit. :D

Are there sharp angles between you and the router? If so, try placing the repeater in a position to make a right angle between the router and your room. If you can get an Ethernet cable and run it through the attic, that is generally the best solution. How far is the router from your room?

better to buy a new router than an amplifier

If you don't want a cable, yes! We have one at my parents' house (placed about 2/3th away). It goes through two walls and from downstairs to upstairs. The speed/connection is better than if we were to connect to the original (which is often not even in range).
I don't know what brand Wifi Amplifier is good, but I'm sure we don't have an expensive one and it works fine :)

Try Etherner over Power plugs. If need be you can always connect a bridge with the router using these plugs, and then use the wifi from the bridge in case your devices only accept wireless.

i use ASUS RT-N12HP, cheap,. wifi signal trough the walls, it's cover entire house. Just try get one,.. or if you can get two its better.

If your main modem don't have good wifi signal, then the best setup is

ADSL MODEM (wifi disable)--------> short lan cable -----> ASUS RT-N12HP Access Point mode >-------- wifi -------> devices

or if you wan't to used as repeater

ADSL MODEM (wifi enabled)----wifi--> ASUS RT-N12HP Repeater mode --------> wifi -------> devices

the 1st option is better Access Point mode

If you're just trying to get a good signal on where your computer is placed then I would suggest get another router; place it as near to your computer as possible; then use that said router as your access point. But if you're referring to the actual speed then that's a problem of either your ISP or the number of users at the current time of usage.

wifi repeating like that can work, but it will cause a small loss in both ping & speeds. that loss may not be near as significant as your current cut-outs from stretched wifi, but it's worth pointing out that by bouncing the signal thru another device, that small loss will happen.

i'd consider trying to upgrade to a better main router first, then if it still is not a strong enough signal, then you could add the repeater/amplifier.

edit: to be clearer, i mean that the amplifier will probably be better then your current setup being stretched so far. but still not as good as it would be with a singular stronger wifi signal that's not repeated thru a device. (utilizing the main router > secondary device even if they are merely 2inches apart)

edit2:
think about it like baseball.. outfielder needs to throw the ball home. he/she has two options. throw it directly home or throw it to 2nd base for the 2nd baseman to throw it home for them.

it's faster to throw it directly home by a little bit, but much easier and less stressful to throw it to 2nd base and let them throw it the rest of the way. you really want the outfielder to be able to just throw harder and faster ideally... ;)

There are also power lines. You plug one in a power outlet near your router, and another in a power outlet of the area you wish to have wifi. Problem is, they are more expensive then general repeaters.

I have two and it works flawlessly over large distances (my router is on the top floor, one of the repeaters on the bottom).

If you want wifi near your pc, you can have a wifi generator dongle, its quite cheap.

Why not try using a regular router as an amplifier? Haven't checked the prices, but it may be easier to get a router, or less expensive.

Hello everybody!

Sorry for my super late response. I have been thinking about the ethernet long cable option. It would be complicated installing this in my house, but I could try it. However, using a $5 discount in Aliexpress, I bought the Xiaomi Wi-Fi amplifier (just about $4, nice price I guess). When it arrives to my home I will make some speed tests. If needed, I will try installing the cable.

I want to to thank everybody for the super cool assistance here. You are the best, guys! :D

Even though it's been decided, Ethernet cable is still the best. If you install it right, it won't be that ugly.

If you use repeater, make sure you have zero roaming repeater, else you'll get disconnection when you move around. Ubiquity is a good product that supports zero roaming.

I made one back in the (young foolish and moneyless) days

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You should buy a flat cat6 Ethernet cable, and make sure it's full copper and not copper clad aluminum (cca). With a pack of flat cable clips you can route and hide the cable easily.

Yeah, go for better router than amplifier. Or better yet, buy table computer and connect with Ethernet cable, works much better and the connection has less possibilities of being stolen or distracted by your neighbors / random people on the street.