Eltab
Lord of the Hidden Layer
I commend to your attention the thread "Enhancing Hoard of the Dragon Queen" somewhere in this forum. People who played through HotDQ earlier described their problems and discussed solutions.
Personally, I was the solution to this problem when I joined a group playing HotDQ; I brought a Paladin. It took me about two months of real time to train the Wizard to quit running around in circles during combat and hide behind me.
If you kill off another PC in combat, utter the "off-hand" suggestion that the group needs somebody who can stand up and take a hit for the team. You may get a new Fighter or you may get a Pact Blade Warlock.
Personally, I was the solution to this problem when I joined a group playing HotDQ; I brought a Paladin. It took me about two months of real time to train the Wizard to quit running around in circles during combat and hide behind me.

If you kill off another PC in combat, utter the "off-hand" suggestion that the group needs somebody who can stand up and take a hit for the team. You may get a new Fighter or you may get a Pact Blade Warlock.