How to be great?

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What should I do if I have tonnes of free time or want to do a lot of stuff (e.g. learning programming, learning more maths, etc)? Daily schedules that I follow or waiting for inspiration / motivation and giving myself small challenges?

Do schedules work or are they used to shirk actual work? Mike Tyson, Tiger Woods, (so high performance people) had schedules. Even college professors have schedules. They schedule their research (i.e. what they're good at and what they've worked on all their lives) around the many hours of shit like teaching etc.

But I read about bill gates when he was at harvard and he did so many things it was unlikely that he made himself a schedule.

I know the easy option may be the schedule but I feel like it would squeeze the life out of me.