What measures should humanity take to maintain the balance of oxygen in the atmosphere?

Oxygen will remain in the atmosphere regardless of any actions of people. The more mankind pollutes the atmosphere with carbon dioxide, the more plants will produce carbon dioxide, nature itself restores the balance. But if humanity mercilessly destroys trees, then oxygen will not be generated from where, and over time, the atmosphere will be completely filled with carbon dioxide. But humanity will not live up to this moment, with an oxygen concentration of less than 19%, humanity will suffocate and over time all plants will restore the atmosphere back. Therefore, we must protect trees from destruction and they will protect us.