it is not just about the coin per se, it is about the other side of the supply and demand principle meaning the demand part. in a very simplified terms it is like saying 10 people are buying 100 items every day. tomorrow there will be 11 people buying the new 100 items but the next day there will be 12 people buying 50 new items. and that is why the price rises when bitcoin halving takes place.
but for an altcoin that 10 people the next day are going to be 9 and then 8 and so on. and on top of that there is the hype of the pump of that altcoin, for example in case of LTC the hype was there but the pump failed so everyone dumped it hard that is why it has crashed now.