Surprised not to see Render.com listed under option 4 despite that being an option discussed often here with comparable simplicity of deployment to Heroku
I love Render, have been using it heavily personally as well as professionally. I like it for fulfilling my demands efficiently. But I sometimes find the name is a pain point, it is really hard to search especially combined with some generic words. It seems fixed now but I remember at some point of time even "render status" wouldn't lead me to the right place.