I’m so sorry you couldn’t get what you wanted.
For me it’s a different situation - childless by circumstance as I didn’t meet anyone in time, and didn’t want to settle. I met someone at 47 and he was 51, but by then it was too late.
Things that helped for me:
Biological clock got extremely loud in my early 40s, and then the symptoms of perimenopause kicked in which was an acute reminder that no, I am not going to have children. Weirdly, that helped me make my peace with it, as the menopause WAS going to happen, I didn’t have any control over it, and it was going to draw a line under my aspirations. It was as if my body made my mind up for me.
Travel, flexibility, a bit more financial stability, a possible early retirement have also helped - as has planning things for a life without kids - actually having different aspirations, goals and dreams that don’t involve me having a baby. Invest in your relationship with your partner - it’s important and something many parents stop doing when kids come along.
Finally, other people’s kids have helped. In one way it’s seeing how hard it is, and how I don’t have to do the hard bits. I get to do the fun stuff. And I can still make a difference to a child’s life - friends and cousins kids are in my will as my investment into their future. Someone left me money once, not much, but enough to take a trip out of my comfort zone and change my world view. You can be a mentor, listen to kids read, volunteer at Brownies, Guides or Scouts, respite fostering, all kinds of things. As a previous poster said, there is more than one path to take in life, and although I found accepting I wasn’t going to have kids hard at first, I’m now 49 and in a good place. I like me, and I like the life that I have.