I guess I would go to fiat if I really wanted to trade, since getting into any other altcoin could cause you getting caught into a bad move by the altcoin you get into even if for a short period of time.

I don't see anything wrong with using tether temporarily, for example to sell the $11k top and buy a nice $9k dip. Now it's too late, simply hold, we aren't going much lower than what we've already seen. Too many people wanting to get in at sub $10k actually push the price to $10k+ again so they don't want to miss out.

Remember that trading may end up increased taxes so you might as well hodl.