I'm assuming you are male?

You can't help what you're attracted to. Some people like blondes, some people like brunettes, some like men, some like women.. there's nothing wrong with any of it. I don't think you can change what you are attracted to. You can force a relationship with someone you're not attracted to, but what's the point in that? You say you're losing attraction for women, but are you becoming attracted to men? It's complicated, but I don't know how you can "help yourself" because I don't think sexuality is something you can force a change with. I don't know if that's what you wanted to hear, but I don't know what else to say on the subject really.. sorry.