New to Instacart…Quality Metric Seems Unfair

Sorry if this has been hashed out a lot, but where do I look to figure out exactly what Instacart wants me to do? I’m not sure how to interpret the feedback. It doesn’t seem actionable, like “you did this specific thing wrong, so do this instead.” I’m making reasonable replacements and only refunding when I absolutely have to. Also for customers who give less than five stars, why is there not a specific reason listed? I could get so much better at this if I was given useful feedback. What I’m getting is a grade with no explanation so how do I improve?