We can have all the discussions in the world about renovating the forward group, but until this defense is addressed, no forward group is going to succeed.
It's really going to have to be trade targets in order to fix the backend. There are some internal options like Mancini for 3RD, but the left side is so bad that there really is no internal options. Fortescue is not ready yet (minimum 2 season out, more likely 3) and the others are losing time to become 3LD options (Robertson, Jones, etc).
Took a look at the UFA/RFA options from this upcoming class and a few stood out to help the left side of the ice:
Bowen Byram (RFA)
Dylan Samberg (RFA)
Jakob Chychrun (UFA)
Ivan Provorov (UFA)
Vladislav Gavrikov (UFA)
Marcus Pettersson (UFA)
Oliver Kylington (UFA)
Byram likely costs a bunch based on trade value and Buffalo is going to want to shake their team up, we're also not in a position to offer sheet if they are a lottery team.
Chychrun is going to try and cash in on 7/1 if he does not re-sign with Washington. Provorov is likely the same. Gavrkiov is going to make a pretty penny too, but I tend to think he is worth it compared to Chychrun and Provorov. He's much more consistent than the others. I
I would have taken the chance on Kylington this offseason, but that ship sailed. He also got hurt and hasn't played much this season, so maybe he'll have reasonable demands this summer.
Pettersson has gotten better each season, so he may be an option too. Samberg is interesting because Winnipeg is paying a lot this season for their team, and have a bunch of UFAs including Ehlers. If they want to keep a few UFAs, Samberg might be capped out and exposed as a trade candidate in the summer.
Also Lindgren is not a UFA option and should not be one at all. Hopefully Drury liquidates and helps push this team in a better direction.