I have never used the Music feature. I got a few months of free Premium when I got a Pixel phone, and decided to keep it. I generally only watch YT on the TV, so ad-blockers are much harder to implement, if at all.
I'd consider downgrading, depending on if there are any hidden gotchas, like not getting the premium quality video on some channels, or losing some audio options (like what Amazon does with ad-supported Prime.)