Common traits among those who achieve a 10km time in the low-to-mid 30s

I haven't been running for very long, but I've already hit the 43–45 minute range.
Now I'm challenging myself to break 40 minutes.
If you manage to enter the 39-minute range within a year,
you'll quickly reach a time in the low-to-mid 30s.
It varies from person to person, but looking at the running records of the strongest Masters runners, their time reduction is incredibly fast.
On the other hand, while some people reach the early 40s easily, those who struggle to break 40 minutes usually seem to get stuck in the 37–38 minute range.
This was just my personal observation.