I think you can DM and email the project team about the tokens you have to get a solution on that problem.
I've experienced the same thing, but the project developer will always provide time or solutions for the tokens I currently hold, like my case i have NOW tokens and the team is currently migrating to the BSC blockchain, the problem i'm having is the minimum amount of tokens i have to send to exchange for new tokens, i can exchange whenever i want for the minimum amount of tokens they charge, but the fees on the Ethereum network are very expensive, I better buy new tokens and leave the old tokens in my wallet.