Django 5 + Postgres for a future release

I have a simple site with next to 0 traffic in a Python 3.10.0 + Django 4.2.5 + MariaDB 15.1 app.

I am considering to re-doing (not migrate) it to Python 3.12 + Django 5 alpha and PostgreSQL so that by December end it’ll be brand new site as well and do the promotions / marketing for 2024.

Plan is to host it on Google App Engine Standard Environment due to free credits (initially, ready to get billed for post free credits).

What are the pitfalls I have to look for ?