1st way: Bursting as a support with a Water and 2 Fires.

Steps: 1st step: Blockage

2nd Step: Stone Wall

3rd Step: Terrafication

4th Step: Tree Bind

5th step for a second beetle or whatever you fight: Tree Bind

I have tried bursting like that but it's not the best way to burst earth as a support.

This method gives more exp for earth as a support (exp is almost same as what water gets) than what you posted there:

1st round: Terrafication
2nd round: Shield Defense on pet
3rd round: Tree Bind
4th round: Blockage (Goddess Skill for earth)
5th round: Blockage (Goddess Skill for earth)

if you set it up on IM remote, top priority is Blockage
and also one note: you will get more exp if all assist skills are MAXED.