Have you had a full testing work-up? Sometimes there are hidden factors that don't show up in a basic screen (like clotting factors that can affect implantation/getting oxygen to the baby). If you have coverage for that testing, it can be really helpful (for more than that -- that's how they discovered my Hashimoto's Thyroiditis).
Barring that, I have two recommendations:
1. The obvious one: live as healthfully as possible. Particularly given your anxiety, I would think that some daily exercise and relaxation (meditation/yoga) would be almost critical to getting by. As you know, trying to have a baby when you know you will likely have problems doing so is fraught and anxiety-inducing in and of itself. So take extra care of yourself to manage all of the stress in your life and keep both your body and your mind whole. Be gentle with yourself.
2. Take a baby aspirin every day. After my first couple of miscarriages, my reproductive endocrinologist said that he could do all that testing, but it would cost $2K (no insurance coverage at that time), and the first line of defense if anything was wrong would be baby aspirin (apparently a number of those antibodies can lead to clotting-type issues that restrict bloodflow), so why not try the baby aspirin first and see if that works? It did. (And my subsequent test results a couple of years later confirmed that that was the right call -- in fact, by the time I was pregnant with my son, I needed heparin). There is very, very little risk associated with low-dose aspirin (in fact, I know a doctor who is taking a full-strength aspirin daily as Covid protection, given the clotting issues with that disease), so IMO it falls into the "may help, can't hurt" category. (Obviously, if you have any medical conditions that might make it a concern, don't do it until you talk to your doctor!)