First I plan to fix my slice. This alone should knock off about 10 strokes from lost balls and pitching out of trouble spots. I have David Leadbetter's book "The Golf Swing" and "Cure your Slice forever" by John Huggan. I plan to read through both books multiple times and practice all the drills in the books.
Then I will also work on my putting. By cutting out 3 putts, I should be able to knock off another 5 strokes.
I think I might even be underestimating how many strokes I can save by doing this, but it should at least get me down into the 90's, if not better because it will also build confidence in my golf game.