Total agreed with you i bought the SUI NFT blueshark, with all the noise and all, it went up a bit and after it went down, In my own opinion i think the era of NTF is coming to an end, just like how the ICO era ended, but we shall see in the coming months.
Obviously you forgot one of the basic rules of trading: "Buy the rumor, sell the fact". You did the opposite, bought NFT after SEO made an announcement about the upcoming event, which concerned those who kept NFT Blueshark in their wallet. This announcement was regarded by many as an announcement of an airdrop for the holders of this NFT, and therefore its price increased. And accordingly, when this did not happen, the price of NFT fell.