MBA Essay/Narrative for Industry Change?

How do you write a good MBA essay when you're trying to change industries? I work in pharma marketing but want to shift over to MBB consulting. Have an econ degree from a Big 10 public school, stupidly didn't pay attention to internships in college and was unable to break into the companies I wanted to afterwards. Went with pharma just to get some kind of job that wasn't complete operations monotony. Realistically, I have 0 interest in pharma and don't want to work anywhere near it post-MBA. But when I look at advice on places like Reddit, everyone makes it sound like you have to have all of your past experience contributing towards a cohesive narrative based on what your end goal is. The problem is that my experience kind of seems eclectic? My degree was econ, my job experience is pharma, my volunteer work is environmentally-oriented, and my end goal is to work in consulting. I'm having a hard time coming up with the kind of "story" that business schools seem to want and it seems like the only way to write something like that is to just say you want to stay in-industry.