Nobody really knows the exact reason, some people say it was due to some April fools joke and some people say it was due to some ETF news but really the only ones that know the true reason is the people who bought bitcoin during this time that caused the price to go up.

If we could reach to people who bought bitcoin from 4100 all the way to $5k than we could know the exact reason why bitcoin went up totally, without them whatever we say will literally be just speculation. I think it was just seeing how close the bitcoin is to the resistance for too many days in a row and seeing how if a whale could eat up a big chunk of it than people will follow and that whale could sell later during the next resistance at peak prices, that would help the whale and increase the price at the same time.