blossom gave you a much more authoritative answer. My perspective is very much an outsider one–my wife worked for a bank her whole career, and as it happens my job as an attorney often involves me interviewing finance people of various sorts and asking them about their backgrounds and jobs and such.
That said, I can draw on that background to just reinforce the other answers you got. I do think some working Finance professionals would say something like an accounting background can be the most obviously useful. But at the end of the day, if you are in the Finance department for a corporation, say, your job does involve helping the corporation do its overall business by understanding how that business can best be financed. And high level Finance people may indeed have input on important strategic decisions because of various financial options/implications. Similarly if you are involved in lending to corporations, you might benefit from having a good understanding of the businesses in your industry area.
So I think being good at understanding the business side of things is almost always relevant to people who work in corporate finance.
And these days, that typically involves a lot of business analytics. I think that concern I have heard repeatedly expressed is that a lot of lower-level jobs in something like business analytics are exactly the kind of job a good AI could take over or at least consolidate, such that there might be one human managing analytic processes that used to take more humans to execute. But at least having an understanding of what business analytics involves seems obviously relevant to Finance people to the extent they will very likely be seeing the output of such processes in the course of doing their jobs.
My two cents is where I would be concerned is if you were a kid who really did not like the relational side of things and were hoping you could mostly just work away individually doing analytics. But I really doubt that people who are comfortable with at least understanding such processes will be less valued, there just may be far fewer jobs where that is basically all you do.