Invest what you can afford to lose, meaning invest anything that you see go to $0 overnight that won't change your daily life.

I believe it'll go up & down to various reasons--alt coins going up, government trying to intervene, other sources accepting it, etc. But fundamentally, over the long haul expect it go up. Said this in 2010, 2014, 2017, and again in 2021. Buy & hold, if it goes to 0 life moves on. Though, I personally believe the floor is too strong and invested now to drop to 0, but wouldn't shock me to see it hit 4 digits in a massive crash if rates rise overnight. First thing folks will liquidate is cryptos. But still believe at the end of it, it lasts.