Don't beat yourself up too much! As (perfectionists) pilots, we tend to be really critical of ourselves, often to the "unhealthy" levels. This can turn into depression etc...
Let's look at the overall BIG picture:
You have had a long, successful, accident free flying career. I think you would look just fine to a prospective employer. Capitalize and sell yourself on the BIG picture (LOTS of experience and a safe flying record). It never hurts to be a bit humble (I learned from my mistakes and moved on....) Dwelling on it is unhealthy and wasted energy.
PRIA is typically used for 121. I am not certain if Part 91 or 135 will be using it. But regardless of that, just remember that NO pilot I have ever met is "Iceman" perfect. Were all human!
Hope this helps you! Stay motivated, eat healthy, exercise, and get adequate rest. A new position will present itself when the time is right.