Some advice...thanks...

Hello fellow RN's ...
RN here, pretty much stuck in the country (woods of upstate, NY).
Was in car accident a few years ago, have been on SSD; but
am being given chance to mainstream (within physical strengths /
limitations ) by taking a course - The only problem is I having deciding
"what" to specialize in? I'm told "RN Case Manager."
However, I have to "pace" my physical activity - so I effectively need
a "flexible" schedule, yet an area of practice where I can be effective,
productive, and have a decent income. My other desire is to move/ relocate
to a metropolitan area for more access to positions once my on-line education
is completed.
Any suggestions anyone? Many Thanks...