Fi's good for any situation which requires empathy. Social workers, nurses, or any other occupation which necessitates "emotional labor" are things to whom Fi could lend itself. The arts are another area. Really, the OP's question could have been answered pretty easily by looking at any run-of-the-mill Myers-Briggs article on Fi-doms.
I also think that this is a bit of a silly discussion because functions work in pairs. Where there's Fi, there's gonna be Te. Even if your preference happens to be for the former, you still possess the capabilities of the latter, and no one is gonna question the bankability of extraverted thinking.