Focus on what has your attention
I sympathise with the desire to think about 20K & up levels, but it is hard to do that when overwhelmed at runway level. This is one of the areas where GTD really works. You can use it to get next actions under control first which helps free up the attention and time to focus on the higher levels.
David said it him self: control first, perspective later
You can't hope to get perspective and climb in altitudes if your daily life is not first and foremost under control.
Then, you'll have the mind clear to think to your altitudes.
My proposal is perhaps to first raise straight to area or responsabilities (20k) or Objectives 1-2years (30k) and go down from there (you might have something urgent or that will become urgent soon) to identify your mid term priorities.
Then, go for the top level (50k) and define who you are and what you would like to do with your life. Then go down again from 50k to runway, including the altitudes you've already viewed (30K, 20K) because, coming from 50K, you might want now to clean things up (and add things, of course).
You might think there's some redundancy at the lower levels because you move through them more than once. My personal feeling about this is that you need to empty your mind at these levels first before climbing higher. It's not efficient for me to try to move higher with a mind not cleared of low level stuff.
Just like an alpinist that need to acclimate (?) himself to some intermediary altitudes before climbing to the top.
