Anyone who has been dating for several years will have experienced a fair share of rejections. Trust me you’re not the only one in this situation. Without knowing you, I can’t give any personalized advice, but I can share something I have learned as a (somewhat) older single, and that is just be yourself. Try-hard and pandering doesn’t work with girls. Always be polite always be a gentleman, but be yourself.
My grandfather a”h was a great guy who got married at 38. I never asked him what took so long. All’s well that ends well. Chazak Ve’ematz.