To the OP:
Judging from the number and variety of games you play each day the only means of costless improvement would be some sort of novel self-analysis of your existing games. You need to spot patterns of failure and defects - however small - in your games and target improvements.
Have a look at LiChess' Insight data if not already done so for clues. The PC free-program LucasChess can analyse games and create 'problem-puzzles' based on game moves which have significantly deviated from engines as well as providing a means to test/train yourself against master games - can be good clues there. In short, you have to do something novel that will objectively identify game defects.
Alternatively join a physical chess club, human players are very good at spotting failures in others, before themselves!
Whatever, expect to spend more time in game analysis and playing less!
To the OP:
Judging from the number and variety of games you play each day the only means of costless improvement would be some sort of novel self-analysis of your existing games. You need to spot patterns of failure and defects - however small - in your games and target improvements.
Have a look at LiChess' Insight data if not already done so for clues. The PC free-program LucasChess can analyse games and create 'problem-puzzles' based on game moves which have significantly deviated from engines as well as providing a means to test/train yourself against master games - can be good clues there. In short, you have to do something novel that will objectively identify game defects.
Alternatively join a physical chess club, human players are very good at spotting failures in others, before themselves!
Whatever, expect to spend more time in game analysis and playing less!