Maybe an example would help. It sounds a little bit like you're talking about "dungeon flow" or branching options (e.g.: you start in a position X, and you have several options about how to move from there, and which one you take determines what your next options will be, and you might be able to return to position X to take a different option in the future, or not, or whatever -- it flows like exploring a dungeon), but in regard to....what?
Character abilities?
Bonuses to dice rolls?
Narrative exploration?
D&D has long used the idea of a dungeon as a thing to beat in and of itself, in addition to the linear level advancement. Being level 20 just helps you beat the dungeon, which gets you the gold/fame/fortune/whatever your character implicitly wants for some reason.
I'm not quite grokking if that's what you mean, or how would use this with regards to an alternate to leveling (since you can easily have both).
Ok, lets say you are a Fighter. So, what do you have to do to earn your living? Lets say that the answer to this is connected to the answer of who trained you and why -the answer of your origins. Now, lets say that Mordor and Isengard are two different locations that interact with your origin location. You are threatened because if you rest too much evil will get you in the end: so you have to act and fight it or face it. The ways you have to face it are supported by the rules. You can now make your choice about what to do.