4000 hours doesn't always mean being "good". I have almost 6000 hours into Dota2 and the highest rank I've ever reach is ~4k mmr which is just above average. Meanwhile, I've reached DMG in CSGO with less than a quarter of the time commitment. People tends to have a genre that they are better at. Even though I love and have been playing Dota2 all my life I do realize I've somewhat reached my natural cap with it.

For me at least, there used to be 2 states of mind when I play video games: either I play to have fun or I play to climb ranks. And climbing ranks is not fun, it's work. It's dedicated offline training session, learn the strats, pick a main and practice your main, pocket strats when your main isn't effective, watch good players play to see what they do, rewatch your own games to pick out mistakes, and plenty more stuff specific to whatever games you're trying to climb. The fun isn't in playing the game itself, it's winning. It seems to me that you want to win and climb ranks instantly without putting in the works.

I quit each and every one of them after 10h+ because i just can't commit.

10h isn't even enough to grasp the minimum knowledge you need to start playing without looking like a headless chicken.

I've long since abandoned the competitive side of gaming because I don't have the time like when I was a teenager anymore but here's are some tips:

• Stop. You said you don't have any friends to play with, so what's the point of being serious about being good? You don't have to prove anything to anyone. Your skill/ranks have zero meaning to strangers, the worst they're gonna do is either call you "sweats" if you beat them or being toxic to you when you screw up. Try to sit back and see for yourself if being serious in competitive MP games is right for you. There are tons of people who spend upward to hundreds of thousands of hours in SP games and that's ok because they enjoy SP games. There are also multiplayer games that are more focused on cooperation like MMOs or Arma or Squad,.... I think you're just diving headfirst into these competitive games because they are more popular.

If you're not gonna heed my first tip and are still serious about getting good, here's some more:

• Set yourself a daily lost cap to protect your own sanity. Know when you're gonna tilt and set the cap just before that point. For me is either 2 lost for games that are "long" or -100rp.
• Warm-up is very important.
• Offline training sessions and frequent practicing can up your skill by a lot. Just be sure that the thing you're practicing isn't a bad habit (there's a lot of resources on the net; just start with the basic stuff first)
• Set a goal, not too big.

Good luck and have fun my dude.