All of the companies I've worked for in the last few years who were Rails stack on Heroku have or were migrating to k8s deployments on the big three (AWS/GCP/Azure). For personal apps I'm looking at consolidating my stuff to Digital Ocean.
I've done that and now I kinda regret it, as there are cheaper alternatives and DO doesn't really offer much more than a VPS. I'm trying to switch to hetzner (but the 40$ per month on DO won't ruin me economically, so I keep postponing it)