Cryptocurrencies are known for their high price volatility. Sometimes, they can have a sudden increase (and then a sudden drop). The expression 'Crypto Come Back' may simply refer to a price recovery of a cryptocurrency after a period of declines.

Recovery of interest:

It can also refer to a situation where a cryptocurrency, or a specific group of cryptocurrencies, is regaining the interest of investors after a period of lack of enthusiasm or negative news.

Informal context:

The expression is likely used more in online communities or informal conversations about cryptocurrencies, rather than in a technical or financial context. $BTC