you need to become more attractive than her.
HUMANS are programmed to find people who are more attractive than us and to replicate with them. so we are programmed to have sex with HOT women.
women are programmed to have sex with HOT men.
so you need to become at least the same level as her in terms of attractiveness.
if she is a 6ft tall blonde bombshell who walks around in Gucci, Ferragamo and Valentino, then you need to be a 6ft+ tall athletic man in good shape going somewhere in life, dressed up as a real player in Armani, Versace & Dolce
i am sorry but a 6ft tall blonde bombshell especially if she is hot, will not stick around with a clown looking pick up artist dude, unless he is famous or rich. then she isn't really attracted to him, she is attracted to his wealth.
people always want to evolve in life and grow. nobody wants to date the ugly fat short guy/girl... UNLESS she has a lot of money, that is.