If BTC drops, buy more BTC because it will go up first before the alts. After the BTC goes up, use it to buy the alts that you are considering for more than just buying the alts outright. You will have leverage that way. BTC > Stable coins > Alts > BTC > Alts then drop is what i think the cycle in crypto.

However selling prematurely or even to tether could lose potential gains. Hodl and buy on dips is the best strategy imo, unless you have emergency like a loss of job then you must sell. But never take a loan to bet on crypto.