5 year commitment

You cannot dabble and think of attaining mastery

Any skill needs deliberate practice for a long time. 

You have to be at it even after the thing lost its initial sheen. 

You want to learn table tennis you need 5 year commitment to get to a good level. 

May be in year 1 you would have achieved the proficiency of low hanging fruits but the mastery is made in the incremental improvement of nuances.  

Even for being a decent amateur in say guitar you need at least 5 year commitment. 

So don't have a lot of hobbies have just a few and start with only one and may be post the 1st year you can add another, since the 1st one would have stabilized