After making some poor life choices and letting an ex get me into a hole, I’ve been working on getting my credit score back up to good place. I’m currently an authorized user on a credit card of my dad’s and as its a business card, it has a pretty high balance ($15,000ish) and 80%+ utilization all of the time. That is the longest standing account going towards my credit history at 25+ years. After every other account of mine has been closed, my only open accounts are my car, student loans, and two small cards that are only a few years old.
Is it better for my score to remain an authorized user and have the history in my favor? Or do I drop the high balance and just start where I am history wise? Which impact is greater on a score?