Well, I have to say that Harmonoid is the best one I’ve found, it has a ton of cool features, it works and it allows you to be able to see your collection by album and it doesn’t use Electron. Right now its development has stalled a bit but it’s still pretty much in good shape, though.
Is Amarok still a thing? I stopped using players a few years back in favour of Spotify, but I’m considering self hosting a collection again.
TDE still supports it, but I’m pretty sure KDE no longer does. So you can still get it, but it will require a little extra work.
I’ll probably end up using a streaming server or something. I use too many disparate devices these days where I want things to work more like Spotify instead of your traditional Winamp style player.