Tips on beating Onyxia with this setup?

Tips to beat Onyxia with this setup?

I struggle so hard to beat Onyxia even though I have a team that should be good enough. I either lack damage in phase two (if I play defensive), or totally get overruned in phase 3 if I play more aggressive. I am so hard stuck and I’ve seen no progress even tho I have been practicing for over two whole group ilvl increase. Please any help 🙏🏻