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If your lawn hasn't been aerated in over a year, or the soil is incredibly compacted, do two passes with the aerator. The first pass should follow your mowing pattern and the second one should form a perpendicular angle relative to the first. Stick to 20 to 40 holes per square foot as a rule of thumb.

Enhanced root development, better fertilizer uptake, and improved drought resistance.

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. 

You should put pre-emergent herbicide and fertilizer on your lawn in the spring. Pre-emergent herbicide keeps weeds from taking root. Fertilizer helps your grass to grow lush and dense and blocks future weeds from growing. You can also add amendments, such as sulfur and lime, to enhance your soil quality.