Tempest Trial

I am having trouble doing the hard difficulty on the tempest trials My main team is all 5* Ninian Corrin F Priscilla and Erika. They usually make it to the final level where I loose. My second team is 5* Olwen 38, 4* Xander 39, 4* Ursula 39 and 4* Sophia 40. My last resort is 5* Ike 35 5* Navvare 35, 5* Kagero 34 and 5* Azama 33 because I have fear on him. My question is what should i be doing on the final map with these characters