Given you are happy to work say 60 hours a week, what is the optimal use of the extra 20.
For some it might be free work for their employer in return for something. Example might be in financial trading etc. to get a bonus or raise or promotion in a shop that is killing it.
For some it might be leetcode and reading everything on levels.io and teamblind.
For some it might be active investing for example property renovation.
For some a side business.
For some TOGAF and Scrum qualifications.
But remember 1000hours a year is a lot to bet on your company or colleagues vouching for you and being in a position where that matters.
Etc.