There's the zoo of AWS. Maybe there's something there you can use - Lightsail came out I think in 2016 - but good luck trying to find it out of all the plethora of weirdly named services. Again, total beginner here, and AWS can be daunting even to experienced developers.
You can go with Linode or Digital Ocean. You would need to set up a VM with all the dependencies and make it secure. Oh and you'll need a database - should that sit on another VM? What about backup and restore? What about deployment? Sure, you can use Ansible, but that's yet another learning curve.
Render launched in 2019. Fly.io came out 2020. As far as I remember, there wasn't a competitor that offered the sheer convenience for the hobbyist beginner on the level of Heroku.