must be some nice garden soil by now.

why are you sifting the ashes?
What began as reddish-black, hard-to-work clay loam is now black & easy-to-work. And because I try to add more to the soil each year than what I'm taking out of it, the fertility continues to improve.
Sadly, my rural garden seems to be going in the opposite direction.

It began as much more fertile than the home gardens; but since I have been unable to add enough organic matter for 6000 square feet, the tilth has gradually been declining. The reduction in organic matter may be contributing to the drainage issues there. I purchased my leaf vac in hope of collecting enough leaves to improve that soil, and had an opportunity to do so... but that time was spent this year in moving soil instead. Who knows... leaf drop is so late this year, that another opportunity may yet present itself.

The strong winds being forecast for tomorrow should bring down most of the leaves that remain, and a lot of the yards locally are still leaf-covered. Knock, knock... "could I clean up your leaves for you? No charge, just happy to help".
The reason I sift the ashes is because I'm separating any unburnt wood, charcoal, and the clay/cement plugs from spent fireworks (whose remains are also burned there). And because the burn pit contains screws, nails, staples, etc. from burnt planks, crates, pallets, or old furniture, I run a strong magnet over the sifting tray to pull out any iron.
just be glad you're not hauling it by wheelbarrow and buckets. i did that for about 30 yards of topsoil, sand, compost and pea gravel. it was a lot of work but now at least it doesn't flash flood in that part of the fenced gardens.
You moved
30 yards of material with a wheel barrow???

A lot of work indeed, you're a better man than I am Charlie Brown... and/or a lot sorer.

Makes my back hurt just thinking about such a task, I'm guessing it was done gradually over time.