Can you be more specific what coins you keep $7 worth (I hope it's not ERC20, your $7 doesn't even cover transaction fees)?
It looks like USDT TRC20, @OP wants to exchange/swap it and I think he doesn't have any Tron in his wallet.
The transfer fee is low, so it will take about 18 Tron to complete, if you cannot buy it, write your address here and someone may send you 0.5 USD to you.
Trying sunswap may be good but I advise you to do more research (just google it) before exchanging.