I think a year of experience from our QB and a top-10 TE, and this team is well on its way.
The other upgrades, I think you can take your pick.
LG, one of the OLB spots, DL depth, another CB, any of these could be useful additions.
I might say offensive coordinator, then duck. The guy clearly has some good ideas, but then he doesn't use them as much as he needs to.