For anyone that's built a SaaS with existing customers and struggling to find more, the best method I could find for prioritising what features to build was from a blog from Superhuman.

Basically every time a customer gives you feedback or a feature suggestion you ask them how they'd feel if they could no longer use your product - not disappointed, somewhat disappointed or very disappointed.

What you really want is focus on the latter two.

- Very disappointed: Your customers that already love you. These are your biggest advocates who want to shout your name from the rooftops. You will want to keep serving their needs so they remain loyal customers.

- Somewhat disappointed: These are the customers that have a need for you right now but could drop you when a better alternative comes along. If you serve them well then you can turn them into advocates too and drive more referrals.

This is basically the gist of prioritising the right things but obviously harder when you have less customers.

Here's my landing page for the thing I haven't finished building yet https://usertake.com/. If it's something that might be useful it's free for anyone that can give me valuable feedback along the way.

Here's the Superhuman blog for reference: https://www.therevisionist.org/website-authority/social-media/hacker-news/