small collections and sentimental items

Until 6-7 months ago I used to collect small figures which aren’t that costly depending on the year, rarity, etc. Some of the ones I have still hold some sentimental value because I got them from a friend or my mom, that sort of thing. My ideal goal was donate or resell some that might have some value because I feel like they’re wasting space and they collect dust, they’re small so it’s hard and time consuming to keep them clean all the time. How do you deal with stuff like this?