Take a long hard look at offensive and defensive play calling and decide whether it can be fixed with the current coaches or if it's time for a change (I'm pretty certain they'll do this anyway). Go heavy offense in the draft, o line and wr's. Re sign veteran players at reasonable cost if possible.
Case and point, this team doesnt need a massive overhaul. There is a ton of talent on this team. They just need some upgrades, and maybe some upgrades on the coaching staff