Not just any coin but to hold or trade on coins with potential to produce returns. Not every coins you get to hold would give the hodler profit despite how much you continue to hold if it's a shitcoin it wouldn't change or make any difference with time. Trading isn't assured either.

The best coin to hodl for long in this cryptocurrency ecosystem is bitcoin, you don't lose hodling for long like 4-10 years you'll be sure of making armful returns on investment based on the size of your portfolio.