1st FET failed

Im at a complete loss. One year ago I did my first IUI and got pregnant but miscarried 7.5 weeks later. So we did our first FET this month and were told we had a 79% success rate. We did icsi and pgs testing and transferred our best embryo. I’m so devastated. My doctor said we could try another one next month but maybe I should do an endometrial biopsy (I did one 2 years ago already) or a scratch and then use Benadryl as well. I’m curious if anyone went through a failed FET and then had success the next round and if you have any advice or tips. I’ll take anything at this point just to feel better :/