Any suggestions on how to freshen it up? Should I do a music fast? Should I practice more active music appreciation?
Other things to try: - Explore some exotic places with http://radio.garden/ - https://sudo.fm/ - https://musicforprogramming.net/
If Last.fm is still around that may be useful, they are/were great at finding similar artists so you could go to one artists page, click through similar artists a couple of times and find something fresh that you didn't know you liked.
It was also great because you could hook up your music player of choice via plugins to Last.fm and it would do a damn good job of regularly finding your next favourite artist/track on your profile page.
Like most things tech related the music realm only seems to get worse as time goes by.
Listening to Eliane Radigue's Trilogie de la Mort was a great departure and opened a whole new world of music for me. It changed the way I listen, not just music, but everything.
I too get bored with music, so now I experiment making my own... https://www.youtube.com/watch?v=63slAz55V6U https://stefanpowell.bandcamp.com/album/autonomous-drone-lul...
You can even save their top songs as an auto-updating playlist. It's a great way to discover new music.