bitcoin and ethereum are still the best cryptocurrency for long-term investments. and there are several other altcoins such as Ripple, Bitcoincash, and EOS. almost all altcoins today take a long time to make a profit.
I also agree with you to choose bitcoin and ethereum to invest in the long term which is very high profit. for other coins, I recommend in the 10th rank and above, the quality is clear and the price is high.