I have every Yu Gi Oh card from the first season to the end of the GX series and don't know what to do with them. Any ideas?

well আপনি could sell them on ebay অথবা something অথবা save them and put them out of site like your basement hoped i helped

Give them to me (or at least all of your bugs, pyros and dinosaurs)! = D But ebay অথবা any other auction website is a good option. If আপনি have a swap meet অথবা something locally, আপনি can also sell them there. অথবা আপনি could donate them to Goodwill অথবা any other charity organization.

Since they ARE collector's cards, though, I'd keep and display them. Use them. Maybe start a trading service.