Hello, the USDT will not decrease in value once you exchange it, I highly recommend that you do not exchange it, a big increase is coming and you might regret it

a question, I dedicated myself to buying World coins, I have about 400 coins, but the value of each one is very, very low and I just hope that their value increases. My question is, when the value increases a lot and I exchange or convert the WLD for USDT, if the value decreases, will the USDT also decrease or will it remain as I exchanged the USDT? Please help me.