"I know I need to break the isolation, but I fear I'm too deep into my own world."

That's the procrastinator in you talking. Or the fear that those things you create won't go big and solve your dream. Forget the YC path and build a side-project/lifestyle venture that is interesting or challenging, and get a good routine going. Maybe it takes off, or maybe it's a steady side-project for a few years - no shame in either.

Build anything that gets you early users as eventually they will take over and be demanding features that give you the impetus you need.