Next steps ladies.. (opinions plz)

In the last year I’ve had 3 miscarriages and have no living children. I have had genetic testing done and basic bloodwork (vitamin levels, folic acid) and all has come back okay. My OB has put me on 5mg folic acid, vitamin D and baby aspirin for when we try again. From your experiences, what else should/could I be asking to have tested/done??