Can’t change default payment method on family sharing

My wife and I started a family a year ago and up until a week ago I was able to change my payment method whenever I wanted to even though I wasn’t labeled the organizer. But now I can’t and my subscriptions are about to cancel and I can’t redownload any apps because the payment method I had is no longer usable. We’ve tried changing it on her side since she in the organizer but it’s still not updating on my side nor will it allow me to change my payment method