Deciding between 4th round or moving on

I am trying to decide if I should do a 4th round of egg freezing. I keep going back and forth. I’ve always wanted a big family and never wanted less than 3 kids. 4 kids was always my number. But, I’m 38 and single with zero current prospects of getting pregnant naturally. At 34, I retrieved 21 eggs and froze 16. At 37, I retrieved 12 eggs and froze 9. I just did a third round where they retrieved 6 eggs and froze 4. My total frozen egg count is 29. My doctor says on average you need 10 eggs per live birth. I’m on the cusp for 3, and she’s worried that my cycles have trended downwards quicker than she expected as the last two cycles were only 8 mos apart.

I know I’m really lucky with 29 and it’s more than the average person has, but I have a deep fear of having low quality eggs and not having good outcomes when it comes down to me having to use the eggs stored to either have children with a partner or even as a SMBC. I’m not ready to freeze embryos with donor sperm. I want to be certain I have enough eggs for multiple births but it’s also so expensive and takes such a mental and physical toll. Maybe I’m overworrying or overthinking and I should just take the 29 eggs for what they are and move on. If I end being a single mom, maybe I’d be happy with just one child but right now I can’t say that for sure. It’s so hard to predict. I could have several embryos from 29 eggs or I could end up with just 1 or even none. I’m not getting any younger and I think if I do a fourth round, I should probably do it now.