We all know Bruce Lee's quate that he does not fear a person who drills 1000 moves, but a person who trains one technique 1000 times and also that research states that to master a technique you need 10 000 hours of training.
So it's important to drill, but what to drill! What is the key feature one has to nail down to be successful. It's harmful to drill 10000 hours something you don't need.
Some ideas how to find out is to figure put what is the problem in your game and start fixing problems. Can't start standing up...do something and see the holes in your game or reactions in opponents moves. Start doing microdrills and positional rolling to learn.