First of all you need to know that having mangal dosha is not a crime. Many people have a successful and happy marriage despite being mangalik. What is important is that proper matching is done. Also remember that in your horoscope you have Kaalsarp dosha which brings delays. Ketu in 11th house aspects 7th house and Rahu aspects 7th lord Mars. This is the reason why your efforts have gone in vain. Also Taurus lagan people are very particular in what they want in life and marriage partner is no different. Be ready to make some adjustments.