Suggestions for filling in bald spots i my lawn

Aerate, fertilize, water, and mow. Oh, and sunlight. No sun, no bermuda.
EDIT: I should add that to get your lawn to fill in you'll need to fertilizer over the normal rate, which means you'll need to mow more often as well. If you have a lawn company doing your service they'll likely not get you there as quickly as you could by pushing your turf super hard.

May want to put some organics on the bare spot, like Black Kow. It helps

It looks thirsty... what is your irrigation schedule? I'd also check for insects (webworms). I think I see some black earthworm castings so you probably have decent soil.

What is creating all those holes? Look like critter holes.

1 lb of Nitrogen per M(1,000 sq/ft) per month, mow at least once per week(twice is even better), and keep it watered but not too much and you will have a nice thick green lawn by the end of the Summer, if not sooner.

Mightyquinn said:

1 lb of Nitrogen per M(1,000 sq/ft)

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This is excellent advice and will push the growth but just know the more you put down the more you will have to mow. Pushing growth means pushing the mower, too. It's also better to get to that 1lb of Nitrogen through weekly .25lb applications vs. pounding it monthly with 1lb all at once. I know some of the guys who have sprig projects going are pushing .5lb N per week. Bermuda will gladly take it all but that type of growth will require mowing every other day.

Redtwin said:

This is excellent advice and will push the growth but just know the more you put down the more you will have to mow. Pushing growth means pushing the mower, too. It's also better to get to that 1lb of Nitrogen through weekly .25lb applications vs. pounding it monthly with 1lb all at once. I know some of the guys who have sprig projects going are pushing .5lb N per week. Bermuda will gladly take it all but that type of growth will require mowing every other day.

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You make a good point about what kind of Nitrogen is applied and how it's applied. If you are using a slow release you could probably get away with 1lb of Nitrogen/M in one application but if you are using Urea or AMS you would want to break those down into 2 applications 2 weeks apart at a minimum or 4 applications/weekly would be ideal. Just something to think about. Once the lawn gets thick and healthy you can back off those numbers just to maintain what you have.