If you’re using a punch that looks like a fork for the long areas, then a 2-hole punch at the ends, you’re halfway there.
But instead of using that Awl, get 2 big leather needles and put the thread through the leather at the beginning of your stitches with one needle on each side of the leather.
then pass both needles in opposite directions through each of the next holes, almost like a string of figure 8s. You can back stitch at the beginning and end to make it stronger.
Much faster, and you’re not dealing with the lock stitching that keeps trying to pull out as you do the next stitch.
View attachment 105601
View attachment 105602
On this knife sheath I realized I had enough thread to back stitch the entire thing, so it’s double-stitched the whole way around and tripled on the ends.