As far as what to do with what you have... you can look into doing ladders, or even look at applying the "fighter pullup routine" to those exercises.
As far as ladders:
One ladder: Do a rep. Rest a few seconds. Do two reps. Rest a few seconds. Do three reps. Rest a few seconds.
Then repeat, starting back at one rep.
So: 1, 2, 3, 4, 1, 2, 3, 4. Or: 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3.
Over time, work up to ladders with more and more reps in the top set. Or do more ladders. Or do both. It's a much more enjoyable way to get reps in than just adding a rep per day.