My fingers are crossed for you.
What has helped me in the past when I couldn't muster a hopeful attitude was just recognizing that it is medically possible. That's enough. You don't have to believe it's going to happen, just remember it could. I understand with how frustrating this cycle has been for you that this tww is so hard.
I have gone on a couple of retreats with the Fertile Soul. Randine lewis told us that, in her observation, and she admits that it's anecdotal, the best outcomes came when women had an attitude of "this probably isn't going to work, but I'm open to being surprised." I had always assumed that success was dependent on me having a positive attitude, so I felt scared and hopeless when I couldn't muster one. Randine freed me up to just feel whatever I was feeling and that it wasn't going to jinx me.
Happy fishing, hope you catch something good!