Fly was supposed to fix Heroku but my bill more than doubled since they changed how they charge for shared CPUs.

https://community.fly.io/t/cpu-quotas-update/23473

I work at Render (render.com); we have over 4 million developers on the platform, and we've migrated many large (and small) Heroku customers over because of our more modern capabilities and scalable pricing.

https://render.com/docs/migrate-from-heroku

You have your range of options - it depends on the size of your team, the kind of apps you're running, etc. The answer can be anything from an "ssh script" to AWS (or K8S), etc.

If you're running something that's too expensive for your taste and can share more information, happy to brainstorm some options.

AWS Elastic Beanstalk gives you more or less the same experience but charges you normal EC2 instance pricing. It's as cheap as PaaS gets.