It’s always QB and trenches first and foremost. If a team is bad at two out of three — QB, OL, DL — they generally top out at a .500 record. When a team is good in all three they’re generally a playoff team regardless of the strength of other position groups.
With regards to value at other positions…. Fill in the best talent that you can find because guys like Cook, Gibbs, Jefferson, Chase, etc don’t grow on trees. Get the trenches right, find a QB, get a few playmakers and most competent coordinators should be able to make something positive happen.