Is my experience not "serious" enough? (radio)

I have been on a job search for around 7 months since graduating from undergrad, and I ultimately had to take something menial and unsatisfying in August just to keep the pantry full. Since then I've managed to get a few interviews for analyst positions, including a non-IBD/SA role at a BB. I always think I do well on the interviews, but it never pans out or develops into further rounds. A close family member, an academic who has worked closely with upper level finance folk, said that my experience that I often talk about in interviews isn't taken seriously enough.

My extracurricular that I got most of my non-coursework skillset from was in college radio, and I thought I had a great gig creating the station budget (it has a lot of money given to it from the school), complying with FCC guidelines, ordering equipment, etc. It's my go-to during interviews because I genuinely believe I had challenging experience with it and it's great fodder for "tell me about a time" situations.

Bottom line--should I be talking about radio as much as I do? I don't really think there's much experience I have that is as relevant to the roles I'm applying to, but job offers really aren't coming my way and I'm a little concerned that it's not going to get better the way things are going. Is there such a thing as experience that isn't serious enough, despite feeling like you've gotten a lot out of it?