Buy at least a few other asset classes to hedge your bets e.g. shares, bonds, commodities, property....... vintage wine, fine art etc 
Are bonds an investment or a way to keep your money safe from inflation? They don't appreciate in value much.
Shares as a hedge? Like when you buy Gamestop at the right time?
For me the best way to be cool about Bitcoin is holding long enough. When you can say you had it for 3 years or more, you learn not to care about FUD or flash crashes. You'll know you can't lose on this bet.