Broad diversification is key to success in investing.
Saving money in 2 coins or stocks can wipe half of your capital if one of the two goes south.
Put your dough in 5-10 coins, if one of them collapses you only lose 10-20% of your capital and can quick recover your losses. Read what professional investors do, they recommend investments spread over 10-20 ventures. Above 20 is difficult to keep track of. But 5 is a bare minimum, everyone can keep track of 5 coins and be insured against large unexpected hits.
Keeping track of 20 investments isn't hard. If you find it hard, then maybe a buy-and-forget strategy would be best for you. Altcoins are super risky. I wouldn't keep any significant amount of money in them. Or bitcoin either, really. Hopefully you don't have all ypur money in crypto.
If it's not hard for you to keep track of 20 investments, feel free to do it. For me, the best I can follow is 10. My point is 1-2 is too few and risky. 5 is what everyone must do. 10-20 is great if you can do it.
The alt market is a thing in its own right, so I am talking about the money you allocated to investing in crypto, not about other money locked in real estate and other things. The money you put in the crypto market still need to go to 5-10 different ventures/coins.