Ask HN: SaaS ideas?

So I have the infrastructure built from my last SaaS project, job queue management, dashboard, payment, website etc.

I want to now use the same infrastructure to build another SaaS.

Want to get some ideas but I'm coming up dry. Ideally to use the existing code base, it will have to be some process that takes an input of data, converts it, and outputs a valuable data.

However, I'm also open to other SaaS ideas, maybe even a web application, but have not much experience in this domain.