Halving equals more scarce.
Halving equals less inflation.... it in no shape or form equals Bitcoin to be more scarce than it already. Scarcity in Bitcoin doesn't always play much of a role because during a bear market there are more sellers than buyers.
When there are more sellers than buyers, it can take a while for the ratio between supply and demand settles to a point where the price stops going down and moves sideways for a while to later start appreciating again.