For now that the bull market has not reached it highest price and there are still opportunities for altcoins to do well before we get to the peak of the bull market, I do not see a problem with what you have done. It is not yet time to take profit therefore investing in other coins can be a good decision to take. It is only a bad decision when you invest back into altcoins when what you should be doing it securing your profits that you have already made. You can also invest in Bitcoin for full security of your profits. Having over 20 cryptocurrency is too much in my opinion because you could have achieved better results with less coins than that number as it exposes you to more losses from them being failed investments.