Hitting his check down faster.
Everyone on CB is well aware that Jake's numbers when pressured were AWFUL. PFF had him as one of the best QBs in the country when not pressured, and when pressured he was one of the worst.
From my seat, there were many times each game (especially as the season went on and the pressure on jake ramped up) where a check down was available but it was missed or thrown too late.
If he can improve in this area, then that will also help back the pressure off of him. If he can start beating the blitz, then that will help him take the next step.