As a GM once said: "Until you reach FM 2300, opening study should be 10% of your study time.
I can guarantee you that openings are not deciding your games. Blunders and missed tactics are.
Your last Daily game: https://www.chess.com/game/daily/859419746?move=0
You lost in 17 moves and failed to see an obvious tactic. Also you moved way to fast for daily chess.
After looking at many of your games. All of them were decided by blunders and missed tactics. But if studying openings brings you joy then keep studying them. But don't expect to improve as long as youre missing the obvious.
I suck at theory. I don't know enough for my rating, I only know a 30-move semi-slav line, and the e3 stuff. Marshall: Not enough, must go deeper than 20 moves. spanish, not enough as white, english, just learned it. sveshnikov, not enough. and can someone teach me the new caro meta as white in the c5 line with Nf3 cxd4 Qxd4 Nc6 Qf4 ? Need to know that too, I need waaayyy more theory, IM/GM level theory, that'll help me improve, any theoreticians that can teach me ?