10% maybe too much, I see now the altcoins in the public are in the thousands. I prefer maybe 5% because it's better tokens are few but potentially, but a lot of tokens on the market are just shitcoins.
You also have to be able to sort out the shitcoin category with potential coins, because not all of them become shitcoins and that 10% increase is also often found by everyone on every coin that has potential and is already in a good category.