Some advice/suggestions to help with some New Years Resolutions/Goals?

For the new year, I made a few goals/resolutions to try to achieve. I made them in the realm of reasonable but not too easy so that there's no benefit to them. However, with 3, I seem to have hit a few plateaus.

1. be able to do 10 pull ups at the minimum for 1 set (of course more is better).
2. increase my chest press dumbbell weight from 45 lbs. dumb bell to 55 lbs. dumb bell (currently I'm at 4 sets of 7 for 45 lbs.)
3. increase shoulder press with dumbbells from 30 lbs. to 40 lbs. (at 5 sets of 7 right now)

With the dumb bell exercises, I'm not trying for a one rep max. I'm thinking that I need to train some other secondary "helper" muscles as they are probably holding me back. Any ideas would be helpful! Thanks!