The recent fall of Bitcoin is mainly influenced by the US stock market, and it indeed coincides with the top time interval of the four-year cycle theory.

If you want to hold long-term, you should at least wait until there aren't so many people discussing it endlessly every day.
As for the short term, it's quite difficult to handle a period where Trump can just shout and change things at will, and you don't know how he will shout.
Sometimes, being in cash is a form of wisdom.