ComradeDaisy

first of all, there appears to be a fork of Cantata (which is still my music player of choice as well) that is still getting updates (maintained by a one nullobsi), if you're on Arch, it's available on the AUR as cantata-qt6
my current fallback option for local music playback is fooyin, I don't know for certain whether it checks all of your boxes at the moment, but it is still very much in active development
I also use jellyfinmediaplayer for music on my jellyfin server, but that doesn't have lyric support (unfortunately)

I'm personally fond of Sway and Kitty

I still love my Pebble smartwatches, and of them I prefer the Pebble Time Steel. It still lasts like at least a week on a single charge.