Are you trying to tell us to store our funds(Bitcoins) on exchanges? Because that's the only way I know you can convert Bitcoin to usdt. Except you want to use multi coin wallets like trust which I still see as unsafe and not reliable. Yes the transaction fees is a very terrible thing at the moment but we shouldn't let a short time issue create for us a long time wound( something we will remember for ever).
Don't store your Bitcoins on exchanges. If at all, not all of them. You can just keep a small amount of funds there just Incase of emergency especially in times when fees are very high. Its a method that might save you fees but you may end up losing your funds through such method.