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Yes, it’s worth aerating a lawn. Even the most diligent mowing, watering, and fertilizing schedule is not enough if the roots are not able to benefit from the care and nutrients you’re giving them. Even a lawn that’s already healthy can benefit from aeration because the more air that circulates around the roots, the stronger and healthier it will grow. 

Before you put down grass seed, you should cultivate your soil or add two inches of topsoil. You should also put down fertilizer at the same time as your seed to prompt healthy growth. Be sure to water after you put down grass seed, especially for the first two weeks.

If your lawn has some lumps and bumps, yes, aeration can help—although it may also be beneficial to take on other steps, like irrigation, fertilization, and dethatching (also known as scarifying). You can also use a power rake to physically break up the bumps in your lawn, which can help you achieve a more even look.

Overseeding after aeration is not always necessary, but it can be highly beneficial, especially for lawns with thin or patchy areas. Aeration creates an optimal environment for new grass seed germination by improving soil contact and reducing competition from thatch. If you aim to thicken your lawn, address bare spots, or introduce a new grass variety, overseeding immediately after aeration can help rejuvenate and enhance your lawn's overall health and appearance. However, whether you overseed or not depends on your specific lawn goals and condition.