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Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

There are several possible reasons why your Bermuda grass is not thick, with the biggest reasons being too little water, too much shade, compacted soil, drainage issues, and too few nutrients in the soil. Bermuda grass needs frequent and direct sunlight to stay thick, so thinning grass is likely the result of a lack of sun. 

When it comes to combatting the effects of soil compaction, core aeration does a far better job for a longer period of time—because it actually removes dirt rather than just pressing holes into it. By taking dirt out from under your lawn, core aeration allows more light, air, water, and nutrients to penetrate into the soil below and help your grass’s roots grow even stronger.

Moss growing in a lawn is a sign of poor soil that makes it hard for grass and plants to grow. Moss thrives in these conditions and spreads easily, so it can quickly take over your yard if it’s lacking in nutrients, too wet, or has an excessive amount of shade. Moss in the lawn isn’t always a bad thing, but it can prevent turfgrass from forming deep roots.