I'm a one-man army, too. I've built SaaSHub https://www.saashub.com & LibHunt. I left my job a few months ago and since then have focussed on developing and growing SaaSHub.

It's been growing steadily for the last 2-3 months. My expectations are that it will generate ~$2,500+ in January and $100k+ in 2020 given the current growth.

I have a massive list of ideas that I will work on next. Yet, I'd like to be fully sustainable (in an expensive city like Sydney) before jumping to the next project/idea.