Just you have to keep on the wallets those coins that you are not going to sell 1-2 years. And on the stock exchanges, keep a small part of the capital for trading. In the case of such corrections or pamps, you could always sell or buy altcoins quickly.
I agree with such idea that you have to split all your coins. The coins that you not gonna trade and if they are on hodl mode - offline.
All the others you have to put on different exchanges.
And the first rule of every trader:
1. DO NOT keep all the coins/tokens in one exchage