Today is the last day to file/ pay taxes since they extended from Apr. 15th.
I imagine a lot of people in DeFi/ Crypto had to take some money out to pay our wonderful Uncle Sam his share.
Don't worry, this won't last long. This summer I expect new ATH's on a lot of coins. I of course am not an expert or pro trader or anything so take my word with a grain of salt. It's just an opinion.