It's a store of value in the sense that it has a non-zero price at any given moment, but when people say that one of the functions of money is to be a store of value, they mean that its value must be reasonably stable so that its future usefulness is predictable.
> A store of value is an asset with as close to 0% volatility in price as possible.
You just proved his point. In this example, bitcoin's volatility is closer to zero than gold's. Thus, by the quoted definition of "store of value", then in this particular time frame (it would be very different going back 5, 10, 15 years), bitcoin is the better store of value.
And when it goes down the answer is to buy the dip. If you have funds needed for other things, they should be in lower-risk investments. As people get older, they should be moving large amounts of equities into bonds to lock in their gains.
There is a reason people still have things like checking and savings accounts and CDs.