Good luck moving back to full on-premises. I think that in the last 10 years some people forgot how many problems you can have when you self manage a dc, or when you just “rent a couple of servers from somebody”.

Sure, hybrid approaches do work; keep your main infra in the cloud and supplement it with some cattle rented servers (that can fail with no prod impact) to handle predictable workloads.

But think it very thoroughly before getting fully back to “on my premises”. You’ll discover a world that you never knew it existed.