When the sun is dry, there will be fire to help, but what does it mean to avoid too much soil?

In the five elements of birth, wood flourishes, and birth stem is Jia Mu or Mu Yi, representing the wood life of the core monument of life. The five elements need to be balanced, so there must be fire to help. Wood can make a fire to vent, which can reduce the prosperity of wood, and so can soil. The prosperity of wood will decrease faster, so the soil should not be too much.