Chemical equilibrium can be shifted by changing the conditions that the system

experiences.Decreasing the temperature is equivalent to decreasing a reactant (for endothermic reactions) or a product (for exothermic reactions), and the equilibrium shifts accordingly.For example, if the temperature is increased for an endothermic reaction, essentially a reactant is being added, so the equilibrium shifts toward products.Le Chatelier's principle:

If an equilibrium is stressed, then the reaction shifts to reduce the stress.