How to protect your rights as parking space prices plummet

If the price of parking spaces skyrockets, would you be willing for the developer to take back your parking spaces? If it is a legal contract to buy or sell a parking space, after the contract is fulfilled, there is basically nothing you can do. If there are a large number of people, maybe you can join forces and put up slogans like "unscrupulous businessmen" and "shady developers", hoping that the government can help coordinate. However, the risk is also high. Be careful of violating the crime of disrupting social order.