I occasionally come across a project where it's easy to see the person is furiously churning out the development of their ideas, but don't have many (if any) stars or contributors yet. And I have contributed to some that I thought were interesting, but needing attention to things in ways I happen know how to do.
You could probably do exactly the same thing, but of course using different search criteria to match what interests you.
If I search for Lisp code with microservices as the keyword, I get 6 hits, 2 of which are fairly current, one that's starting to get stale, and 3 that have not gotten any love for years. Obviously not a great example, and specific to one language that might not be yours (and seemingly unfit for the purpose), but this is just a demonstration of how I use github's search.
Here's that: https://github.com/search?l=Common+Lisp&o=desc&q=microservic...
I would probably go look at areas which typically struggle to attract extremely competent developers on account of not being the hottest thing -- maybe educational work, or international development, or science research?
It's called DFlex: https://github.com/jalal246/dflex. it's a JavaScript Project to Manipulate DOM Elements.
Dflex has 5 separate packages. All decoupled and part of the same project.
So, if you interested, let me know.
Edit: unfortunately, it is not related to microservices.