Hard to say, but based on what I have been observing since I joined the market, there is no pattern. But the market reacts to every news so that's the first thing that you can look at. But the first thing I do is check on crypto related websites and see if there is any that could have affected the market.
If none, then obviously, maybe speculators are cashing out and taking profits and then it will be followed by weak hands selling because they panic when seeing their portfolio going down.
This is what those that follow patterns do not seem to understand, no asset follows patterns perfectly, now if you take a look at the past some patterns may seem to emerge from time to time but this does not mean that the next time there is an important movement in the price we will follow those patterns.
This is why people lose money, they buy or sell thinking the price will go up or down at a particular time based on those patterns and bitcoin instead does nothing or even does the opposite, this means that even if the overall shape of the pattern did in fact appeared in the market it is not going to be the same and you will be unable to obtain profits by following those patters that you observed during the time you observed the market.
Patterns may help you to analyze and anticipate but like what you have said, there's no certainty that it will
happen again or it will follow the same directions, there are lots of investors who lose money following this analysis blindly,
you need to work it out and be willing to adjust, either you do have sets of back up plans if you failed with your first attempts
or you have system that you use monitoring all the potential next movements,
Very important to set your target and deal with good adjustments if in case things didn't materialize accordingly.