Altcoins are really a lot. But very few promising. I think that now you should not rush to invest. Because only experienced investors can choose from such a large number coin of good coins.
You're right cause only experienced crypto investors have the knowledge of choosing good coins but accumulating more than 6 to 7 coins is not a good idea even for experienced investors cause they also need the time to manage and study every posed by the coins they are holding or else they will loose their investment.