You’re not alone mate, I have been holding a lot of souvenirs useless coins too from 2017 to 2019 but I have already moved on a waste of money and time indeed. Well, learn from the past for sure most of us are wiser these days and will not gamble anymore in half baked projects.
I think we all have experience of holding a coins who didnt recover or turn out to be a shitcoins. This is the risk of holding/buying a not established coins, they're likely to lose their value or be delisted in exchanges.
But from that experience we learn to know better on what coins are good to invest in even for long period hodling. It doesnt necessarily mean only buy popular coins because there are also hidden gem in new projects. However it requires an extensive research to know the worthy coins, so dig deeper and exert an effort.