6.5 mm lining - ERA or transfer?

AP

Hi All - I went in for my last ultrasound this morning and learned that my lining is about where it was for my first failed FET (6.5-7 mm). My second cycle didn’t come close to my first so we had to cancel. My doctor said I can move forward with the transfer next week or do an ERA. He said my lining may never get much better. I have 5 tested embryos left. Thoughts on going forward with the transfer? Would you transfer 1 or 2 embryos?