OCI free tier would be good for this sort of thing.. their free tier is pretty nuts. You can have Ampere 4 OCPU + 24G RAM + 200G block storage spread across 1-4 instances.
Yeah that's pretty wild. I managed to fit my entire serverless stack (roughly 1.2m checks per week) into 2x 256MB VMs and 1x 512MB VM, you could run a monster server on that.
https://www.oracle.com/cloud/free/