The first step is to do a pH test to determine the need for limestone to get the soil to the correct pH for grass.  More on that HERE.  If the pH is acidic, which is likely with all those hardwoods and pines in your yard, the grass will struggle.   This is a great time to apply lime if needed so it will have all winter to neutralize the acidity.  You’ll need to add grass seed either now for DORMANT SEEDING, or in the spring using THIS METHOD.