We switched last year from the Google Maps API to hosting our own pre-generated vector tiles from Open Map Tiles in a docker image (using the mapbox api, and we're hosted somewhere in aws (not my expertise there - I get lost in the acronyms)). It seems to strike a good balance of managing costs + controlling our own stuff while relieving us of the burden of generating our own vector tiles. I could not find great docs on generating them ourselves, and as a newbie to that world I quickly gave up.

Now we just have to periodically take a fresh pull of the tile package, so our tiles aren't too out of date.