To what extent do you need to study opening, middle, ending, in-depth theory in chess?

Well, basically I train 100 tactics a day to improve my chess calculation, I analyze master games and I practice opening. For those who received beatings after beatings to be gaining more than they were losing, they were good palliatives. But I see that I'm reaching an impasse every time I increase the level, as the difference between wins and losses starts to lean more towards defeats, at this point do I need to delve much deeper into chess?