Defense advice for platinum player

Hi all. My ranking is moving between 2000-2200 I have 4 5* heroes but they are not max level so whatever I do my defence is very weak. I have:
Richard 70lv/3 .Aegir 70lv/3 .Vivica 70lv/3
Joon 70lv/3 .Boldtusk .Sonya .Tiburtus .
Wilbur. Rigard. Wu Kong. Little John. Kashhrek.
Scarlet. All max level. Can you help me with any advices how can I set strongest defence?

Sonya, Boldtusk, kashrek, Tiburtus, Scarlett or Joon. Seems good.

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