Are you only looking for exchange platforms where you can also park your cryptocurrencies or would you make use of swapping services as well? You could have a look at the service section in this forum and as of now there are a few providers that offer seamless swapping of cryptos and I believe that USDT (TRON) is also a supported currency. You could also have a look at some aggregators, but I am not very familiar with the risk exposure. I have never used those services to swap larger amounts. Anything else worked just fine for me. But pay attention to the fees if that should turn out to be an option for you.