Late 2017 and early 2018 i was holding lots of coins and tokens from the ico's in that some i really trusted with solution and team (not only me most of crypto community trusted). Now this coins or token became nothing . But some projects i entered to sell for small margin profit these projects given profit . So holding token or coin for long term is meaningless.
You have misunderstood which coins to hold and which coins should be sold immediately.
You buy coins that are already popular and you hold in the long run, of course, you have got a big profit now. But if the coin or token is the result of ICO or IEO, I think it is still fifty - fifty.