All the have a child alone advive always makes me feel so uncomfortable. Especially if someone is clearly struggling with their mental health, which op is right now (due to her situation arguably of course), its arguably not wise for them to have babies.
I'd advise instead to get out of the whole biological clock mindset. To start thinking about other dreams. Other adventures we might have. Friends we could make.
If we find ourselves so fixated on what we don't have that it governs our happiness...it can leave us in a very dark place.
I think continuing to date is important, however, a break from it couldn't harm. Maybe get yourself a sunny holiday. How about an 18-35s solo trip? Something to get you away from yourself for a while. Never know, might even meet a nice lad on one.
The whole clock ticking thing...op maybe one day you'll marry someone who has kids or maybe you'll meet someone who wants to foster or adopt with you or maybe you'll take a job working with children or maybe you meet someone and decide, he is enough, that the idea of children was more appealing than the actual process and reality.
And that could happen ANY time. You'll perhaps be alive another 40 years, plenty of time to meet a man. Likely several men. I think its time to refocus on you. On self development and self love. On other dreams.
I hope you find everything you are looking for. But in the mean time, maybe focus on other adventures.