If we consider a long-term period of 5-10 years, then I do not consider it possible to make an investment altcoin forecast in the crypto area for so long. I believe in Ethereum, I doubt the rest.
actually, if it's a popular coin, then I believe it can be profitable. short or long, I've tried to do this on ethereum, and it was very profitable. Currently, I believe coins like BNB, and other popular coins are also very profitable to hold in the long term. however, you need to pay attention to the development information so you don't miss it and know when the dump or pump price is caused by what things so that you can make a decision after that.
for other altcoins, I also still believe if it continues to be developed, the rest is just to see the development and information like this. Well, the world of altcoins is too wide, we can't just rely on 1 altcoin, because almost every altcoin has different potentials.