This is essentially the problem of getting a girl to fall in love with you and it’s very difficult. If I knew a surefire way of doing it I’d share it, but the reality is every girl is different and has different needs.
If you can figure out what they are and provide them to her better than her other guy friends, she’ll focus more and more on you. That’s where I’m at with my current lady. She’ll blow them all off to come hang out with me. But she still kept them around and it bothered me for a long time.
Getting her to forget about them completely effectively means getting married to her, or at least getting on the fast track.
I’d suggest a different approach. Relationships are stressful, be thankful to the other guys for taking some of the pressure off of you to be the perfect Romeo all the time. Let your relationship proceed on its own terms and focus on getting to know her rather than being the solution to all her problems. This is America, women don’t need men to problem solve for them all the time anymore.