If it was abnormally rainy and cloudy this year. I would let the thin grass go without trying to thicken it up. When the sun comes out next year, you should be good. If I remember rightly, you scalped and sanded this year. I never do something like that to a lawn if there is not going to be sunny, dry weather after the operation. Bermuda likes the sun and is not a water plant.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738