You can rent a roller from your local garden center or rental center. It's a large metal drum with a handle that you fill with water and then drag around your yard, and it'll smooth out bumps. After you roll it, any remaining humps will have to be scratched out with a stiff-tine garden rake and possibly reseeded if the turf gets shredded. The good news is your 50-year-old lawn, despite the lumps, has far healthier soil than the compacted and construction-damaged lawns in newer neighborhoods. As the years go by and the lawn ages, the number of beneficial soil organisms increases.
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