So, this was my first MTB from way back when. It has become my paved trail/commuter/"lend to a friend" bike for casual riding.

I need/want to get a new cassette for it. It actually still has the original Shimano Altus cassette and crank set.

I would like to make it a 1x "something"

Does anyone have any knowledge about which modern Shimano cassettes would fit this bike? Any other suggestions as far as chainring/cassette combos?

Again, this will only see pavement/recreational riding..