Throw on Dragonborn of Bahamut with the Heart aspect, and take Entangling Exhalation from that same book. Use that as often as possible to keep opponents debuffed, it will be far more difficult for them to move past you and they'll be taking damage from it every round. That way they'll realistically see your character as both a credible threat and the best available target, and focus attacks on you instead of softer party members.