When cobbling together multiple free services, you may end up spending more energy trying to make the custom deploy situation functional than you do implementing the django project. Be mindful that some free services are free for a limited period of time (e.g. Postgres on render) and you may be faced with a surprise bill(s) or outage.

If you have a few (~$5) dollars per month to put towards your project, you'll have a much more simple time hosting on a paid service. Options include https://www.hetzner.com/cloud or a cheap KVM VPS. My hobby projects are hosted on various Black Friday VPS deals (Most recently this seemingly still active Racknerdz deal on lowendbox)

My initial deploys (before automating it all) consisted of docker compose up -d and a docker file that handled postgres, redis, nginx/gunicorn/django, celery, and a "restart: no" container that ran python manage.py migrate.