Well the reason no one goes in to too much detail is because it's different for everyone. What works for me might not for you etc.
Find what you like what works for you, go over your games see where you're weakest and work on it. The same as studying anything really.
There are tons of "how to get good" threads. And this may look like yet another one. But make no mistake this is different.. how?
Well, first of all, people keep telling you to study, to get better ratings. But no one tells you how. I mean,
1) how would you really study? Watch opening videos? See master games? Which master for example? Magnus? Caruana? they play tons of games these days.. should you watch Candidate tournaments? Blitz tournaments?
Dang, It's getting more and more complicated. While question stands still as a rock. How would you study?
2) What are you gonna study? Openings? Endgames? middlegame? (is it even possible?). Openings are not suggested before 1800 or something. So you know all basic-intermediate endgame positions.. middlegame is not studiable.. so what? are you gonna study?
3) Books, some says books. Needless to says there are tons of books. Many people suggest Silman's books... Like Amateur's Mind and How to reassess your chess. Both from the same author.. Thing is Silman himself is an IM.. No offense but how on earth he is not a GM but teaching the ways of mastery. Idk maybe I'm just overlooking something here. GMs dont write books until they become an old f.art. Sorry that is the truth. Old time masters are already dead, their ways are old. modern chess needs more writers in my opinion.
Conclusion; what do have at hand? Some youtube streamers? Stephan is good but just teaching openings only.. with an odd russian accent. Levy.. talking at lightspeed.. Hikaru.. just having fun, not caring about telling what he is doing (in human language). Magnus?.. ... .. no comment.
Question stands still.. How the hell can you study? Efficiently, correctly. *sigh