Great players don't work a lot; they spent little time on fixing their weaknesses, while simultaneously keeping themselves happy and healthy by going to school, exercising, taking breaks, & enjoy other hobbies, too.
That way, they avoid tilt, burn-out, & recover faster from those things, too.
Don't work hard; work well:
• https://lichess.org/forum/off-topic-discussion/stop-working-hard-and-start-working-well
• https://lichess.org/forum/off-topic-discussion/an-instructive-experience-i-want-to-share-
• https://lichess.org/forum/general-chess-discussion/why-you-should-resign-in-chess
The more you work, the worse you become; the less you work, the better you become (Sometimes, not working accelerates progress. Believe it or not).
Endou + Fubuki + Kidou + Gouenji = Perfection: