That just happened to me! I bought USPY, then swapped it to USDT-sol and was so pleased with how smart I was and how well I followed directions. Then I looked up the vendor I like, and saw that they take USDT-TRC20, and just spent an hour trying to figure out how to convert it. ultimately decided that that ten bucks can just be left in my wallet and used for the other vendor I like that takes it. Now I'm working out how to get USDT-TRC20, which seems to be Tron, so I'll know how to do THAT. I have very little idea what I'm doing, but I expect I'll understand it more soon.