Market price never moves in a straight line, this is the truth. In fact, it is continuously cycling up and down. Each time price moves lower, buyers come into market as price becomes cheaper. On the other side, when price moves higher, sellers start to close their positions as they take profit. Some buyers who panic because prices are falling, they close their positions very quickly, so there are always reasons to cause prices to move up and down. An interesting fact that you must be aware of, is that it is difficult to predict how far price moves away before it is pulled towards the mean again.
https://aix.trade/2018/01/29/trade-first-pullback/