I guess there's no mastery of skill in trading in my opinion its all experiences accumulated, using demo account will never sufficient and can hardly simulate the real adrenaline and anxiousness when you are trading with real money where it might heavily influences what you are going to do.
but I guess its an alright way to know how the market work, but whats matter is I think emotion management and how to make wise decision financially where the decision is truly made with logic.
that can only be done when we are experienced enough as a trader and I think it requires some kind of extensive knowledge about the cryptocurrency.

knowing current news about project better then anyone else could also put us on the advantage than the other people.
but personally I never ever agree with having a mentor or a coach to direct the way we trades unless you can be 100% sure that you are having the right person to teach you.
there are many self proclaimed gurus out there about trading that actually earns from other people loss, like those that earns from refferal and so on, always be careful when picking someone to teach you as the may come out as someone that only taking advantage.