Yep, it's too risky. Never put all your eggs in one basket, the proverb says. Besides that, in altcoin season like this where almost every altcoin is rising, spreading your funds into several altcoins is better. It will increase the odds that at least some of them, if not all, will rise a lot at some point.

I'm currently investing on about 5-10 coins. Whenever a coin already made me enough profit, I sold them and reinvest the money to another promising altcoin.