Because success is not a target you hit it is an outcome of doing something bigger than yourself.
So more than success, spend time finding something worthwhile that you care so much about that you can devote yourself to it, without worrying about the challenges or thinking about how much time it will take.
And, then when you are on the path immersed into meaningful work that most likely is about something bigger than yourself, success will happen.
It will present itself when and because you were not thinking about it.