@DrCasey, work on your 3* 1st. You have several good ones, Bane, Hawkmoon, Valen, Nashgar, Balthazar, Gunnar, Bergen, Gan Ju, I’m gonna regret saying this but even Friar Tuck since you are light on Healers. So you are about a Quarter of the way there.
Finish Gunnar and Bane, make Hawkmoon a priority unless you have the Ascension Materials (AM’s) to max BT ( one of the Top 4* in the game). Carver is close and could be of use in war so finish him. I’m not a fan of Prisca and would honestly take your 2nd Balthazar over her. She’ll just smack your hand with a ruler and tell you that you’re “BAD”
But for a Stronghold defense team maybe consider
Hawkmoon, Valen, Bane, Balthazar, Bergen.
I also highly recommend your alliance read this. It explains elemental damage and what elements are weak/Strong against what elements.