Seeking Advice: Low-Cost Deployment for Angular + Flask App ($70/month max)

I'm looking for suggestions on deploying my Angular (frontend) + Flask (backend) app with a MySQL database at a very low cost (max $70/month).

My main concern is securing my database. Would using AWS RDS be a good option, or is running a Docker container in production safe and reliable?

Any advice on cost-effective hosting platforms, database security measures, or deployment strategies would be greatly appreciated.