At what point do you abandon an account?

So my main has 167 ranked wins and sadly 216 losses. My LP gains on this account are a staggering 11 LP gain and 22 LP loss per game.

I've since taken to using that account for ranked practice and am only playing on this one I'm posting with, with intent to only play when I'm feeling good and practiced.

Should I abandon my main until next year? Is there really any saving it at this point? Wouldn't I have to win every single game just to climb one division much less a league? #depression

Note: I've been a Silver player for 6+ years after being bronze for 3+. I've tried watching all the youtube vids of top players and guides, I've done everything except the practice tool to practice cs'ing. I still have about 20% of my games where I hard feed because I don't play safe or play from behind and get stuck in the mind set of "have to carry, no one else can...". But I'm aware of this and do try to mitigate it by warding, sticking with team, focusing on objectives over kills, last hitting, playing from mini map and only looking up to fight or farm, etc.

What else do i have to do to prove myself? To get better? Am I seriously this fucking mentally challenged and inept that I can't get better at a god damn video game?