If you want to do pull-ups, then there is one clear path ahead of you.. That path IS pull-ups. Simple, eh?
If you can't do one, have a buddy hold your legs and "assist" you. The better you get, the less he helps until he's not needed.
If you don't have a spotter, you can do the following:
- hangs for time
- jump/cheat pull-ups (start with the acceleration of a jump and finish)
- kipping pull-ups (momentum created with the swing/kick of the legs)
- band assists (they take some weight off you)
- negative pull-ups (jump to the highest position and lower yourself as slow as possible)
There are all tools to get it back. If you can only do one, then every time you walk by a chin-bar knock one out. A lot of folks have a bar or a tree nearby and they knock out a chin or a few every time they pass it or see it.
Those cheating methods are the same thing you'll use when you try one-arm chins in the future.