Looking for advice about climbing the ladder

Looking for advice about climbing the ladder

I am an associate director at a large corporation doing a job that pulls together a lot of skills but is definitely more a "generalist" job than a "specialist" role, moving further from my academic training and more relying on my non-academic savvy gained through my career. In my last year end meeting, my boss shared what it would take for me to become a director, which seems like it could be in reach soon. But, I'm conflicted. I know the promotion would certainly look good and would come with significant financial benefits, but I also wonder if being more senior in a generalist role will make it more difficult for me to find new opportunities if I decide to move either within the org or to another company. I also know my role doesn't have a standard career progression or even counterpart jobs in other companies, so if I do move positions, it will have to be laterally to something that will likely require some learning on my part.

Am I better off not taking a promotion to keep options open at my more junior level, or am I crazy for not pursuing a promotion more aggressively?