It is up to you, You can have a lot of coins they all have something unique, so no one knows when a coin will get a real fame and you will get rich. Why you bother to think that you should have many coins or few if you can have a lot coins then you should have.
It all depends on the coins value. It doesn't make sense to hold a lot of coins that won't give you profit. Quality over quantity, that's my approach. I'd hold a few good ones rather than a lot of shitty ones.