In order to run you Python application 24/7 I'd say you should go with GCE Virtual Machine. Stick with Debian 11, install the right Python version and packages on it and deploy your application. Done.
There are other products like GKE or GKE autopilot that'll do the same thing but that requires a bit more knowledge... Docker, K8s etc.
I'd stick with the basics, GCE VMs.