I like the slice of life bits of K-On! but I don’t like anime about musical bands unfortunately so looking for other slice of life anime to fill that
I’m guessing you are looking for slice-of-life (SOL) anime that are also cute-girls-doing-cute-things (CGDCT) anime given that you asked specifically for something like K-On instead of something like Barakamon or Skip and Loafer
Here are more CGDCT SOL anime, but these are a bit more degenerate:
Toes@ani.social 1 hour ago
There’s been a bunch of great suggestions in here.
I would like to add A-Channel anilist.co/anime/9776/AChannel
And Seto no Hanayome anilist.co/anime/2104/seto-no-hanayome