When choosing an exchanger, please firstly pay attention on its having an additional check and official registration, reviews of other users, the state of the exchanger's website as well as the current status of the exchanger in BestChange monitor. Here you can see offers of different exchangers for usdt to usd
https://www.bestchange.com/tether-to-dollar-cash.html and other currency pairs. When making transactions, remember that in many payment systems they are non-refundable.