RIF

Hi there,
We had a son nearly 5 years ago within a few months of trying (cesarian), since then we have had a blighted ovum, 1 chemical pregnancy, 1 6 week miscarriage trisomy 8, and 10 failed implantations (of high quality embryos). What would you recommend as next steps? We have had hysteroscopys to remove scarring after d&c, and lining recently has been around 8mm. our 50:1 ratio is about 30, and tnf-a just below 30. Last 2 transfers we have done intralipids and pred.
Where should we go next with the investigation? Thaw and test our remaining 8 embryos? A lap to check for silent endo? Further immune tests like DQ alpha?
Thanks in advance