I would never change to appease someone who has already rejected me. Do you not see the advantage in learning what makes people reject you? In social and even work settings, finding out what people DON'T like about you and fixing it becomes a personal improvement for self elevation.
I had someone tell me they weren't interested because the way I looked at people felt like I was looking through them, and I realized I was kind of focusing my vision past people, and that weirds people out. I worked on looking directly into people's eyes and focusing on that point and fixed it.
Learning why people reject you IS personal improvement.