If everything is on the dip is it possible to still trade.!

For example, some coins can be historically very low compared to other ones.

For example, BNB/ETH pair is trading at it's ATH right now.

It means that $ETH is the lower compared ro $BNB ever. So, it is possible to directly sell some BNB to ETH and then buy more BNB back wh3n ETH goes up.