If you're afraid that your new project will fail, understand that you've already failed NOW. You're not putting together your passive income. You're just stuck in analysis paralysis. You're spinning in circles.
That's failure because you're wasting your time.
Dive in. Implement. Build. Make.
Once the project's up, keep tweaking it until it produces results or you learn some very important lessons and you build something.
Something. Anything... is better than what you have now. Worries and not much else.
Stop worrying about FAILURE before you even START. Get off the fence and keep at it.