A bit over a month ago Jim Cramer advised people to sell Bitcoin. Since then Bitcoin has gone up more than 40%

Around March 12th he advised people on his show to sell Bitcoin stating he thinks Bitcoin is being manipulated and that he would sell it himself. https://news.bitcoin.com/mad-money-jim-cramer-on-btc-price-surge-i-would-sell-my-bitcoin-right-into-this-rally/

Since then, and it has been barely a month, Bitcoin's worth in USD has risen about 40%-45% and it keeps steadily increasing almost every week lately.

This guy seriously proves time and time again that you should not listen to him for any financial advise at all whether it's stock market or cryptos, and if anything you should do exact opposite of what he says.