Making the USDT choice is not bad when you have gotten the profits and wanna put them securely without getting fire of volatility. However I would suggest that you just re-invest your profits again into the coins which you think are good investment and are currently down in the price. You should always take such shots and then make more profits out of it.
That is how I am taking more profits here and not by holding by my profits. I will hold my profits whenever I have sufficient of them. Now the definition of the sufficient depends on many things and personal instincts.