I do not think that all cryptocurrency activities have ended on Bitcoin and Ethereum. If you try, you can find a business that will bring both success and profit.
It is true that there are some other projects in which you can invest other than bitcoin and ethereum, however there are very few cryptocurrencies that inspire me any kind of confidence, even some of the coins at the top 10 or top 20 are projects that still have not delivered on their promises and grew that much only because people were very excited about those projects.