Photostructure is a strong starter, but development is slow and it’s still missing important features like sharing. Also, it’s not ooen source.

Immich seems great but doesn’t (yet) support digikam tags ( and since my 100,000 assets are tagged/organized via digikam, I don’t want to move to immich yet and have to start over).

PhotoPrism seemed pretty good, though it also doesn’t (yet) support digikam tags. Also, their self-hosted version doesn’t have all the features of their paid versions.