FET Transfer

Ladies, I have a question for you. I have had multiple failed FET transfers. We have done PGS testing, ERA, switched from a medicated FET to a natural FET, you name it we have tried but. Can someone explain a autoimmune protocol? What meds did you take? I have a call into my Doctor to see if it’s even worth it. This is our last chance. My husband and I agreed we would not proceed with anymore fertility treatments whether or not this last cycle works. Thanks!