Cash on hand

So I hold a bag of XRP and a little bit of other (shit)coins. But everytime I want to sell some coins so I have a bit of cash on hand for when the real crash comes (it will come sometime). But then I see that 1000 dollar cash laying around on my account and think: "that 5% "crash" that just happened is a good moment to step in again", and then all of my money is into crypto again.

Why am I constantly struggling with the FOMO, and how do you guys deal with it? Do you always have cash on hand in case of a real crash?

Disclaimer: this is still crypto money, I didn't put anymore money from my savings account into crypto.