I have a number of items for the different special games but I’m afraid to get rid of them as they..

I have a number of items for the different special games but I’m afraid to get rid of them as they were hard to get. How do I know when I can get rid of an item? Things like pool toys, a rock, weather level 11, cosmetic brush? I hang on to these things because I’m not sure if I’ll need them some time in the future and they were not easy to come by but they’ve been taking up space for some times now. Thank you in advance for your help!