Not all altcoins can be held for a long term return. Some are just meant to make good profit with the volatility then back off or take advantage of the hype get a good profit and abandon the project for another. Only a few altcoin can guarantee one a good return on a long term base. To hold on a long term means a deep research before holding
That's how the market works, you need to understand and you need to assess each project that you wanted to participate.
Not all are good for a long while, some are, but most of it is just plain hypes and only those who know the game well are there
one who really gains a good amount of compensations.