My bad, I misunderstood you. Me personally, no. I don't think Cousins is the answer (at least for the price). If he wants to stay and takes a salary between 15-20M, I'd probably keep him and use the difference to get help on the OL, since he's definitely dependent on good pass blocking. But beyond that, no.
I want a ring more than a division title personally (yes, I realize that one makes it easier to get the other). Cousins can get you that if he's got top notch supporting cast, but that something he's never had here and it's something pretty hard to build from a QB making 35M/season.
Personally, I'm of the opinion that we trade Cousins (as I think we get at least a 1st for him, especially if we ask for a 2023 first) and let Mond have a shot in 2022. I'd trade off anyone nearing the end (Smith, Theilen, etc) for 2023 picks as well if I could and use 2022 to draft higher ceiling development types/bolster solid play out of core positions on the lines. If Mond fails, we're likely drafting pretty high in 2023 with capital to move.