If it is a large collection, advertising locally would be best with many pics showing some of the better cards through a range of years. Listing the sports you have (baseball, football, etc.) will also help. If they are older cards from the 1950s through 1970s, you would find some interest here but again, you would need to list what you have so members can match their wants to your list.
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0