[AndriusSutas]

Two things:

1) Discipline (e.g. dedicate 1 hour daily towards a single project until you finish it)

2) Leverage. Think about which thing / project will provide you with the most leverage in the long run. (e.g. doing ML course will allow you to achieve so much more with new gained skills than (likely) learning discrete mathematics.)

I personally chose to start a business which allows me to have significantly higher learning rate than otherwise would be possible, which compounds over time to significantly more leverage in long term. Do mind, now I am sacrificing my living standards compared to same-age peers (working in big companies), but life is a marathon, not a sprint :)