50's a lot.
Around 5-10 altcoins will do. I have that number and not so much with those because I have invested mostly my money with bitcoin and ethereum. And the other altcoins aren't so popular but it's not heavily invested, it's like an alt that I just wanted to have and hopes something good but I'm okay if nothing goes well with those alts too.
Just like me, prioritizing always invests in bitcoin and ethereum. It sounds simple, but that's my way to minimize risk, rather than having to invest in alt that is uncertain and not feasible.