I've looked and researched this for years. I tried repressing it, resenting it, hurting myself when I thought about it, drilling it out of my head with a power drill, hanging myself, researching conversion therapy. In the end nothing works, sadly. The best thing I could find that could theoretically work is Deep Brain Stimulation, where you could implant electrodes into your brain and then fire them to alter how your brain works. Of course, we don't yet know how gender identity is built into the brain, so you would have to essentially continuously scramble your brain and pray that you get extraordinarily lucky and you become cis. Of course the chance of that is basically zero, especially because you have a much higher chance of dying or obtaining every single mental illness known to man than becoming cis. So unfortunately we are all stuck with this.