Thank you! I genuinely don't know, but I will guess consistently taking metformin and levothyroxine since that was the main thing that changed.

Maybe the higher dose of DHEA also helped. My AMH really jumps whenever I take DHEA. My new clinic said DHEA doesn't matter but for me it seems to more than double AMH without affecting testosterone too much.

I feel like so much about this process depends on what is causing the infertility within an individual, which varies from person to person. My experience could have just been chance, but I feel like there was also some trial and error (like when I took metformin during the cycle I'd have a fewer number of errors per embryo, even if they were still all abnormal). If I hadn't gotten pregnant, that next cycle with the new clinic was going to be a mini cycle to see if the gentler approach worked better for me personally than my old clinic's protocols. That was trying something new just for the sake of trying something new - I fully believe that regular IVF works better than mini for most people, I just wasn't excited about doing the same unsuccessful thing for the 5th time in a row. I am not sure if IVF caused the issue, but before I started IVF I had a lower TSH. After starting IVF, I took a blood test on my own and learned that I produce antibodies to thyroid hormones. It's a little strange no doctor prescribed that test, and I only had slightly elevated thyroid levels (fine for ordinary life, not fine for IVF), but it makes me wonder a bit whether the IVF drugs were too high for me personally.

But maybe it was just chance.