Your Balance Is Already on a Custodial Exchange
Check whether that exchange can trade the balance into TRX and currently withdraw native coins over TRON. Include the trade's cost and the subsequent withdrawal charge. If withdrawals are paused or account conditions prevent access, a low trading rate does not make the route usable.
You can also compare sending the existing asset to a crypto-to-crypto provider. Use the net amount that provider will actually receive after any source withdrawal deduction, and confirm that the deposit meets its instructions.