Django/Postgres/htmx(for interactivity) . I was able to release aipaintr.com in 3 weeks working 2-3 hours daily.
All the new fangled frontend technologies make me dizzy :). On top of that this is my fist project in django.
There is a nice django starter oss project called djangox which takes care most of the integration out of the box.
For a new project the complexity should be on the marketing stack. Choosing a good tech stack is a distraction. Choose something that will allow you to create MVP fast and then start marketing.
djangox definitely looks a bit less opinionated and lighter weight than what I normally use for a starter project, which is cookiecutter-django: https://github.com/cookiecutter/cookiecutter-django
It seems to include most everything that djangox does, and a little bit more, and with cookiecutter's setup process, you can strip out much of what you don't want/need.