WR is WAY down on the list, especially for a QB as accurate as Fields. I get having an explosive receiver is fun, but its no fun if you can't get him the ball...
Bears #1 weakness right now is Offensive line, especially the interior. Peters has done an admirable job, but you know he can only likely do this for one more year. Borom thus far is proving he has the chops to be a LT, and if Teven shows ANYTHING, you have your bookend tackles.
Center however is getting blown up, and the 2 guards we have both have been tried at center and ultimately failed. Both are ok, but both also get beat fairly regularly and are not the type of linemen to just dominate - they are finesse linemen, and I think moving forward, especially with the RBs and QB we have, it should change focus to a power blocking style with smashmouth linemen in the interior.
Which leads me to the other thing tied for #1 weakness - the scheme.
It's been better the past 2 weeks, because the Bears are actually looking like they are moving away from it, but Nagy's scheme has been a disaster since it got figured out in the middle of 2018. Too many plays in the playbook, too many personnel packages (32) vs most teams in the league (12 average) which means play calls come in late, and then the coach takes bad time outs (sound familiar), and most of all, the scheme isn't cohesive or complimentary to the defense - its just a collection of plays with no real regard to the flow of the game.
Replace the coach. Switch to a power run type O line. Replace your interior 3 linemen.
Fields will soar.
Then go get your homerun WR in the 1st round of the 2023 draft.
