The style of writing is unclear, trying to imitate a characteristic that should be grasped. Mouth shape is very important. Learn to use nasal cavity, chest cavity, ventilation, etc. I suggest you watch his videos and action time more, and you will naturally find a rule. You can watch videos of others imitating Wu Zongxian, because imitators sometimes exaggerate and find inspiration easily. Imitation should have nothing to do with age, but it is in a period of voice change. I want to keep a good voice and try my best to control it.