You are your own worst judge of your abilities.
You can’t grasp the limits of your abilities because you don’t know what you don’t know.
You can’t appreciate the full extent of your abilities because you no longer remember what it’s like to have a beginner’s mind.
Ask others to assess you instead. They have a much clearer view of your strengths and weaknesses. The results will surprise you.
You can’t judge your own abilities but a jury of your peers can.