So start shopping some of your defensemen that you currently have that are failing, and look for a few guys that are quick, a few guys that can hit, and one quick, excellent hitter.
Then, you pair a quick defenseman with a checking defenseman. Use the quick defenseman to follow guys around and block shots and keep the hitter in front of the net to clear guys away from the goaltender, clear rebounds, etc.
That way, you'll have a well-rounded defense.
And when trade time comes around, you can shop more guys for that top LW that your team needs.