Most traders manifest your observations through Technical Analysis
https://en.wikipedia.org/wiki/Technical_analysis where you rely on market patterns which repeat all over time. Try to trade the event but dont expect it will last forever. Keep your eyes open and you will spot many different patterns.
I have been checking for the months and the bitcoin falls on Sunday and it raises from Tuesday. Any reason?
does that mean, it is good to sell on Saturday or invest on Monday?