Should I take Multivariable Calculus/Linear Algebra If I'm not going into engineering, math, physics

Do you find the topics interesting? Do you want to learn them? What are your alternatives?

Economics, and several other non-hard-sciences incorporate advanced math in college coursework.

Linear Algebra provides a look at a somewhat different area of math, rather than extending calculus into multiple dimensions. If you can take LA without MVC (often an enforced pre-requisite, but not really needed), I’d suggest that. Unless there is a quality alternative.

Form a purely college admissions standpoint, an advanced math course would look better than a generic elective. Unless you other advanced/AP options. Not that that would drive the decision, but something to consider. But getting through BC is already sufficient anywhere.