Killing everything and starting over is a drastic approach - one more likely to be found in the regimen of the chemical industry.
Is there any turf at all in your yard? What percentage is grass you'd like to keep? You can get rid of a lot of the stickers by improving the quality of the soil and biologic activity, and depending on what the weeds are, you can spot spray with something like the vinegar and orange oil product Avenger, or use the organic AgriLawn Crabgrass killer to take out crabgrass, chickweed, and more.
Post photos of some patches of the lawn, with enough detail that we can see what the weeds are, and there may be a way to restore the lawn without resorting to a scorched earth approach.
_________________ Northwesterner
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