A while ago, when I was interacting with elementary school students in America through art, two fifth-graders, who looked like cocky show-offs, came up to me and asked.
(Them) "Artists, for example, can make a lot of money just by drawing with a quick stroke, right?"
(Me) "Yes, but the work has to be a 'good thing'"
(Them) "..."
They had a look of realization on their faces. A look that said, 'Oops, we don't really know what 'good stuff' is.'
So, what is 'good stuff'?
Good stuff is good stuff, period (lol)
In my case, I believe that continuing the discipline of finding good things becomes the fertilizer for finding what's good for me. It's like strength training.
I think it's fun to know what's good for you. What's good for someone else doesn't have to be good for you, so naturally, when you know what's good for you, you start to see yourself. People who know what's good for them are enjoyable to watch because they have a unique individuality.
To be able to know what's good for you, I think you first have to make an effort to find it and try things out.
But sorry, I can't guarantee you'll find it (lol)