To fix it, trade Raanta and Ceci for a better d-man (while adding another backup) and the team could have a fighting chance. I really don't like the D depth. Boro, Ceci and Greene aren't top 4 d-men
I would recommend watching Vegas (if it isn't too late for you) Zach Whitecloud is an absolute stud of a defensive player. He is easily one of the top 4 D on this team. Hell he is making an argument to be top 4 on Vegas