FOMO - Fear of missing out.
For me, it was actually this year. I actually looked for a $pepe coin around January, because of my love for Pepe Lore memes and couldn’t find anything. Now I missed out on a meme coin of a lifetime.
Crypto is all about taking risk, in fact that's how life works in generally, there is no way you can actually detect the next coin that will pump so that you can put money into it, so it's all about taking calculated risk by putting some amount you can afford to lose on some coins you have some level convention that it will go up... If it works out, then lucky, if it doesn't work out then you try again until you hit the jack pot