I found out that tron has become one of the worst altcoins for sending USDT, and I see people all the time asking for tron donation to sent their transactions.
Only way to use it with low fees if you stake large amounts of tron, do voting and bunch of other stuff, so I would just avoid that circus all together.
Instead of using altcoins and paying additional fee for buying them and exchanging from bitcoin, you can also use second layer solutions like Liquid network, or Lightning Network.