I'm in a similar boat (just newer), what I'm learning is to start getting it out there. Even if it's complex, work out your message and condense it to it's simp

I'm in a similar boat (just newer), what I'm learning is to start getting it out there. Even if it's complex, work out your message and condense it to it's simplest form so that even if the product isn't done you can show people where it's going. Then try to find people who resonate with that message. If they really believe in your vision they'll sign up for beta, and start paying as useful features come online. But you have to communicate the essence of your vision first. I think the idea if polishing what you have so it's always usable before moving into new features is also pretty liberating, so you can show rather than tell where the vision is at today