It should be noted that the quantity of futures and spot purchases should be consistent. Otherwise, if there is a large amount of spot, futures are only one tenth or even less of the spot, then it will not play a role in maintaining value. So it's best to have the same amount.

In addition, don't close your position easily because of the fluctuation of futures. Because your spot is still in hand, the futures trading market changes very quickly. Once you miss the market, you can't offset it.