Follow up to last question- 3 miscarriages

Hi, to add on to my last question.
3 miscarriages (1 at 6 weeks before heartbeat, 2 measuring 9 weeks after strong heartbeat detected with one being a PGT normal embryo).
The only thing that we have found is one copy of MTHFR C677T. Do you have any suggestions for my next FET and does one copy of MTHFR (besides taking folate) warrant any treatment for RPL?