we keep the coins at least 5 years , but its too long imagination. you can proof it. 2018 early NEM coin was top 6 Marketcap now 56. so keeping its useless. we have to updated everytime and get the action the correct time and exit.
Or just search the good coins to begin with like Bitcoin and Ethereum.
5 years are a long damn ass time to hold especially in this cryptocurrency world. You stated in 2018 so everything was just a hype back then and if the project is not being known by the community then it's just pointless.
Also do make sure you have another income source to back up those investment in case you need it urgently, because you don't know what you expect in 5 years.
It's best to have other sources of funds when aiming for long-term investment, it's easy to allow the cycle that keeps happening inside the market, if you dedicated your money for long-term investment, it should stay there no matter what the market comes up, not in a daily basis but better setting your target.
The statement about changing paces is true, and that coin is a good example of a project who cannot compete in the long run. Unlike with BTC and ETH it's been proven by time.
Make sure to go deeply with an asset that you are eyeing to invest your money. The more understanding you have, the more trust you can spare.