First, use Blur and Multiple and Cornerpin to create the light and shadow of the flame on the ground and the light and shadow on the glass.

Second, we need to make the background deformation when the flame writhes.

This step is to use roto to separate the parts that need to be twisted

curvetool： This node helps us make the flame flicker throughout the scene

Click on CurveTool, copy its data, create a Grade, and paste it onto it.

It must be remembered that if you want to modify the brightness, you need to go to edit expression to a certain number.