On Bitrue click assets, then deposits, type usdt, select erc-20 from drop down and you will get an address that you can copy to use in coinbase
I don’t have anything currently on coinbase but I assume you click assets there, find your usdt and you may have an option to transfer when you click on that. You will want to paste in tbe address from Bitrue tht you copied in first step above.
This is where you will see how antiquated Ethereum and tether and anything is on erc-20 network. If we could use xrp we could do this for fractions of a penny and instantly but so many exchanges are not using xrp right now.