Heroku seemed like it was going to be the future back then. Every time I find myself struggling to understand some nonsense in Azure I dream of the simpler future we lost.
They got painfully expensive and then acquired. I still remember the arguments with clients and finally went all in AWS ECS, which is still quite pricey but clients seem to complain less about the Amazon bill then they did about Heroku.
Give Cloud Run a try if you haven't. It's basically serverless done right.
I've got to give credit where it is due... It really feels like Laravel Cloud picked up where Heroku left off. Or at least is trying to.
Fly.io brings back some of that easy of deploy.