If you're willing to self-host, Photoprism[0] is pretty nice and easy to get up and running.
It has the flavor of Google Photos, but it's definitely a step down in UX. One of the features I really love about Google Photos is the ability to jump quickly through time. Like if I'm looking for a photo I took around June 2018, I can get to it in <5 seconds.
I didn't realize what a magical feature it is until I tried looking for it with alternatives and found that they all have a lot of scrolling, pausing to load new photos, more scrolling.
But I'm impressed with what Photoprism has achieved as a small, donation-funded OSS project, so I'm hoping to see them grow.