Let me describe my setup, so that you can compare. I use a Contabo VPS for around 5 USD month to host my Wagtail (django-based) site. The DB also runs on the same infra and since it's SQLite I can back it up externally.
I probably wouldn't be able to handle 0.5M requests, but I am nowhere near getting them. If I start approaching such numbers I'll consider an upgrade.
Check out Wagtail if you'd like to have even more batteries included for your site, it was a delight building my site with it:
Thank you for sharing your setup, I will certainly examine it and compare a bit later. I know my setup is a bit over the top, but it is the easiest to learn, since I live in gcp everyday. I certainly don't expect the .5m traffic, but that is one of the lower tiers for cloud run, serverless execution service. This is just a poc to get my fingers dirty with the MVT pattern.