I am just turning 40. You are 20 years younger than me. You have only opportunities - use them. Try things you might like, apply jobs that sound interesting. You'll find your thing again.
But, more importantly... You sound like you have a depression. Not the kind you can just 'shrug off', but the kind that requires medication (dirt cheap nowadays) and counselling (costs more, but is more effective).
This may sound nasty, and coming out of blue. But taking care of your mental health will give you the strength you need to find yourself and your place in the world again. I know this, because I had depression too. 20 years ago.
Minimalism is nice, but take a look how for example Facebook shows a link to this site. Too minimalist. (This of course does not matter if you don't want the link to be shared).
Many reasons why this is hard.
1) UI design needs to be understood and implemented as a whole. This does not sound good for most of developers. I don't know why.
2) Of course, good UI designer (I wish I am) can create bite-sized chunks - divide UI plan into small parts that are more manageable from the development perspective. UI designer still has to be able to say what parts need to be there before the overall improvement is justified - in other words, when the resulting UI can be evaluated.
3) Developers have always an opinion what is good UI. Many features that make something very good to use for non-tech-people, or easy to learn, do not match into developer view of good UI.
4) Development environment tools, vocabulary and tools are not UI-designer friendly.
5) Dealing the above issues in daily work does not leave energy to have the same problems at free time.
