I don't know whether you have data to proof that people actually buys more Bitcoin after halving? From my experience and observation I think that people buys more Bitcoin before halving, because when halving is happening Bitcoin supply is cut into half, meaning that the scarcity will make price to increase. So ideally people will know that it's more profitable to buy before halving, knowing that after it that price will keep increasing till it hits ATH. So correct me if I'm wrong, because this is mainly based on my personal observation.