USDT isn't the best stabecoins to use for holding your profits. They're centralized and been controlled making it not any different from fiats currency. Your assets can be frozen when held in USDT and the price is been manipulated constantly. Hodling your Bitcoin has always been the better option as it gives you a long term profits when compared to trying to catch the top of the market to sell and bottom to buy back. These targets looks achievable on paper but hard to execute. The volatile of the market makes it impossible to target the exact bottom or top of the market. When you HODL Bitcoin you don't lose even when the market is declining, you only lose when you sell but if you keep on Hodling you'll still be having the same quantity of bitcoin that you had and when the market recovers you profits.
When Bitcoin corrects, you should DCA and buy more Bitcoin and that's why it's very important we hold reserve fiats as they're useful in times like what the OP is describing. You shouldn't regret Hodling your Bitcoin as it's better than losing it to the market when you try to outsmart the market by selling at the top and buying at the bottom. You can't always be lucky to get this price always and at some point you might lose to the market and then you start doubting yourself and finally miss out of buying Bitcoin or buy when the price is above the range which you sold and you get lesser quantity of Bitcoin than you previously owned. Hodling for long term is always a better option don't let any person tell you otherwise.
Using currency as a reserve for DCA is a a good approach adapte. Like hiding a secret weapon until the appropriate moment. This makes USDT more of a hedge against downturns and a temporary shelter in stormy markets. Knowing when to hold, convert, and buy more is a delicate dance. This multifaceted technique, which combines Bitcoin hodling with fiat and stablecoin tactics, shows a deep understanding of the market. Remember, patience is a strategy with cryptocurrencies.