i can only point out the mistakes you have made so that it can help you in the future when you want to invest again. sorry i can't tell you whether to sell or hold that is what you should decide.

your first mistake was to buy an altcoin after it was pumped, and into the bubble. you should never do that. always buy before the pump or when you buy into the pump be careful to sell as fast as possible.

your other mistake is holding for long. it doesn't matter if the coin can rise or not. you have to dump it when you lose a certain amount of money. in your case you have lost 26.56% and that is a big loss! you usually set some sort of stop loss and when it reaches you sell, it can be done automatically. and if you do really believe the coin can rise, then you buy back.
in this case you should have sold at somewhere like -5% and bought back at -26% instead of waiting.