Don't limit yourself to just one thing, but do limit yourself to learning only 1 or 2 things at a time - and learn them as deeply (or shallowly) as you like (since no one is forcing you to do this (ie it's all voluntary on your part)). For a suggestion on how you might approach this, see https://antipaucity.com/2012/12/10/finding-your-niche/#.Yk2s...
It's as important to find out what you don't like as what you do like
Second, work towards the goal of "be an and" (https://news.ycombinator.com/item?id=30855775)
Don't limit yourself to just one thing, but do limit yourself to learning only 1 or 2 things at a time - and learn them as deeply (or shallowly) as you like (since no one is forcing you to do this (ie it's all voluntary on your part)). For a suggestion on how you might approach this, see https://antipaucity.com/2012/12/10/finding-your-niche/#.Yk2s...
It's as important to find out what you don't like as what you do like