nginx proxy manager alternatives

I've been running several instances nginx proxy manager for a while and using a python script I wrote to keep them synchronised but lately I've been having them crash more often than usual.

I'm tossing up between rebuilding it to aim for better stability or looking at an alternative, so figured I'd ask the community for alternatives

Ideally I would like the ability to have 2 or more instances synchronised but not really important as long as they can share the same certificates

Doesn't need any other fancy features as it's mostly for my internal services with just a few opened for outside access

*Edit

Seems swag might be worth a look, thanks all