Does anyone know or have used a service to find tutors in these fields?
There is no better teacher than experience. You can experiment in a homelab extensively, but it’ll never replace experience in a live distributed systems environment.
I cannot stress that tests and peer review are crucial for high availability delivery. Use checklists, ask for feedback, it’s cheaper than outages.
better approach might be to build your own project/mini-startup, then hire a little consulting whenever you hit a pain point