Every transaction is two-sided. I don't follow the crypto markets in detail any more, but if there was a "UNI peak", then someone who dared to enter the world exchanged stablecoins for Uniswap at about the time UNI peaked. That daring transactor might not agree that the rewards are vast.

Timing markets at the hour level is fraught with risk and cannot generally be done without information not known to the broader market.