Receding hairline + non-NT status + 5'11 height + below average face = incel
You definitely qualify (especially in 2023!) plus you are likely rating your face too high.
I remember back when I first learned about the decile scale I also rated my face too highly at first. Many people use the decile scale incorrectly at first, and assume that it is like a grading system where anything below 6 is a fail, but it's not anything like that. 1 is deformed disabled disfigured truecel tier, 5 is average normie tier, and 10 is Gigachad tier. Usually you are supposed to subtract at least one point from your initial assessment for safety, because you are more likely to be forgiving of your own flaws due to seeing your own face for years and being used to it, compared to other people who are seeing it for the first time. You also don't see your face the way others do most times, as in a mirror or window reflection, your face is flipped to the other side, which can throw off symmetry evaluations.
So if you give yourself a 5/10 facially, you are likely a 4/10 in reality.