Why can't I connect to Wi-Fi?

In the last year and a half my phone cannot connect to any Wi-Fi networks. I don't know why but when connected to a Bluetooth devices like speakers, cars, there's no sound. Also i can't turn on the Hot Spot.

What should i do? Btw the phone works perfect but theese are the only issues.

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Was this phone dropped, had fluid enter, repaired, battery replaced, modified with unapproved software? If under warranty and not damaged, Samsung should make repairs or corrections.

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Yes, I drop it often, but it's not a problem, it's protected very well. Had water in the charging port a few times, so far it's working. I haven't changed anything. There are constant updates for new software versions etc. but they are still from the phone. I think it's still under warranty but the store I got it from told me to factory reset it but didn't work

When I bought the phone last year for the first 2 months there were no such problems. But my cousin installed youtube premium from a crappy site and i think has been doing it ever since.

I'm used to it, but sometimes it annoys me, like when I can't connect to my car or TV

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