I also don’t use much data and found Keepgo to work well. It has data plans that don’t expire, you just buy the data and use it until it’s gone. 10GB ($42) usually lasts me the whole year.

US, $42/year, eSIM with keepgo for 10GB of data that never expires. That’s about all I use per year, often less.

Looks like a neat solution, unfortunately, the first post on that site is announcing that they are shutting down.