Is the team on salary or paid an hourly rate for the work they're doing? Is the product successful such that it is generating revenue in excess of paying your team?

If you have the whole team is on salary, then I'd suggest you look at whether you can transition some of that team to contract work, working only when needed and for an hourly rate. There is a risk that that person might not be willing to move to contract and you might lose them, but if you're not actively utilizing someone, I don't see how you can justify keeping them on full-time.

I don't know how you're defining success but it's likely that you can build on the success you've already achieved. For example, there might be segments of users who aren't as engaged as others. Focus on increasing engagement for them. Or, focus on new in-app purchase options, etc., all focused on increasing what's already working to generate more "success" however you define it.

It seems like a somewhat unique situation you're describing. Happy to do a call to discuss in more detail.