Decision making will improve, give KK some time. He turned us from laughing stock of the league into a team that's been in every game right until the end. If you ask me that's not bad at all for a rookie HC with a rookie QB. We weren't even competitive last season.
The defense needs major reinforcements. Chandler Jones, Hicks, Budda and PP are still good players. Byron Murphy looks like a steal, he will only improve. Jaylen Thompson looks promising as well. Draft a big-time playmaker in the 1st regardless of defensive position, and go after a proven defensive starter in FA like we did with Hicks. We aren't very far away from a defense that's about average, which we absolutely need to hang in our tough division. But if we had an average defense, we would be in the midst of the NFL Wildcard race without a doubt.
On offense, I don't think we need to change much. KK installing his novel scheme, that even most of the NFL vets haven't seen before, was always meant to take some time. Especially since the scheme is still evolving. Timings, routes and QB decision making will be much better in year 2. Keep developing Murray, who has shown big-time growth and maturity already, and work on the efficiency of the RZ offense. KK has experienced NFL coaches around him that will help him to improve in that crucial area of the field. Of course OL, especially OT, is always a priority to protect our franchise QB. So anytime you get the chance to land a good OT, be it FA or draft, you jump on it. Isabella, Kesean and Butler weren't quite ready for big roles, but in year 2 they could be ready to contribute. I'm pretty confident the offense will be improved in 2020 without changing much.