In my opinion, no one knows when bitcoin will go up or down, unless someone asks to increase the price or lower the price, therefore it is best to keep checking the price of bitcoin every day, because seeing the growth of bitcoin with your own eyes is much better.
Indeed no one will know, but the ups and downs of bitcoin can be predicted using technical and fundamental analysis. Demand for increases and decreases in prices must include whales as large holders of bitcoin, but cannot fully control the market. If you do a day traser you do have to check the price of bitcoin every day, but if only as a long-term investor you don't need it, stay focused on the main goal for the long term and the price that has been set.