Investing with many altcoin kinds maybe less profit because our money put in multi altcoin kinds, but when we use our investment only for one altcoin when price up we can take much profit but have faced big risk because when price down our money lost all because just invest with one altcoin kinds different if invest with many altcoin.
That is why it is better not to split your money, and it is better to invest it in Bitcoins or Ethereum. By the way Ethereum in the near future will switch to a new way of mining and most likely will seriously increase in price. Therefore, it makes sense to buy Ethereum for long-term investments.