You will start seeing people talk about "sell in May and go away" soon.
Over the past 13 years, bitcoin's median return is actually positive for May, June, and July, and then negative for August and September.
August and September are also notable because they are the two worst months of the year for BTC based on median returns.
Historical patterns are just one factor to consider when taking trades, but this is an important reminder to actually look at the data before following common advice.