One of the beautiful things about buying bitcoin right now is that there is NO NEED to go all in! It is such an asymmetric bet, that in a truly ridiculous upside scenario, investing even a small amount at today's prices will make you very very wealthy. If you invested 5% of your net worth, and bitcoin went up 100x, you'd be 84% in bitcoin at THAT point, but at that time, it would actually be a much safer holding by virtue of the implications of its successful history.

There are a lot of unknowable risks still lurking out there. At this time, unless your net worth is extremely low compared to your salary (i.e. you're young and you basically haven't saved much), going all in is just a recipe for panic-selling when the inevitable volatility rears its head. In general, if you can't sleep at night because of your bitcoin holdings, you have too much invested.