Use a garden rake to break up raised areas and level them out to the surrounding yard. The best way to smooth out bumpy lawns is a combination of aerating and soil leveling. The more time passes, the less noticeable bumps will be in your lawn; as long as you address the root problems and continue to maintain your lawn.
Consequently, how do you level a bumpy backyard?
Thereof, how do you fill a large depression in your yard?