I agree with what everyone else is saying--variety is good! Even people who have really solid "niches" like to branch out and do something else while they're playing.
I'm going to put this out there, and I'm not sure this is quite the answer you're looking for, lol. But, most people who have a "niche" didn't necessarily fall into it because they were born good at it (that's not really a thing), they fell into it because they liked doing it, and so they kept doing it. Over time, they get better at it. My point is, that's just their playstyle, which grew from doing the things they liked. If you like more than one thing, you go and do more than one thing! You'll have more fun that way than trying to restrict yourself to just building, or just redstone, or just minigames.
I have to disagree on the idea that people aren't born good at things. Talent exists, it does have to brought out but after some work you can tell whether you're ever going to be good at something or not as a person who gets good in that same time. It's rare but possible for people to like something without being good at it though, for instance with me and PVP.