the people who get paid the most are those who can call them experts in the field. you can't do that if you tinker in every field.
pick something, work on it, find work doing it and get paid the most.
if the work goes away and you need to pick a new field, then what you've learned isn't wasted, you'll still know how to solve problems, just you won't know the idiosyncrasies or the eco system as well as you did. but you can learn that pretty fast.
point being, learn one thing and stick at it, that way you'll get more money.
pick something, work on it, find work doing it and get paid the most.
if the work goes away and you need to pick a new field, then what you've learned isn't wasted, you'll still know how to solve problems, just you won't know the idiosyncrasies or the eco system as well as you did. but you can learn that pretty fast.
point being, learn one thing and stick at it, that way you'll get more money.