What method can alleviate people's sadness? what do you think?

Smile more. I think even when you are sad, you should smile, which helps to relieve the bad mood. A heartfelt smile, or at least a smile that can mobilize the muscles of the eyes and mouth, has the most positive effect. When you feel sad, try to make yourself smile. Even if you don't want to laugh at first, you can't laugh, but at least it will make your attitude positive.