Here's when the stop loss features become most useful, since you know the possiblity of a retraced is certain, you can always put in a stop loss at the previous all time highs and continuously increase the exit point as the trades keeps breaking new highs. This goes for all the cryptocurrency and not just for bitcoin.

With alts though you should be very cautious as what tends to follow such milestones is, traders securing their profits by cashing out which if you're not careful you'll be dumped on and since there isn't any certainty of an alts rasing again due to the numerous numbers in the industry, you might end up holding a shitcoin that has lost value.

Bitcoin on the other hands tends to increase more after previous all time high is been reached just as we saw with it breaking the $20k trading price few weeks back.