It's simple arithmetic, don't hold new altcoins for long, they can fetch you good amount of money but sooner or later they will become shit coins, if you want to hold for a very long time hold the best coins, BTC, LTC, NEO, ETH, XMR
True, coins and tokens that have the potential as you mentioned are always suitable to be held in the long term, but for new tokens it will obviously not be suitable because the potential for development is not so great which can cause sudden death.