Talk to your customers
I just got off a great call with a bootcamp. I won't go into details but it's a reminder of the importance of talking to your customers!
I have so much feedback on my new website Bootcamp Index now! They gave me lots of tips on what they were and weren't willing to pay me for and how best to monetise the site.
It's easy to build things in private and not show your project to people because that invites criticism. If you are willing to put yourself out there though you can get amazing feedback that hopefully translates into cold, hard cash!