How can I turn brown spots on my lawn green again using baking soda?

Here's a post that might help you - https://www.hunker.com/13405009/how-to-repair-yellow-burn-spots-on-your-lawn-with-baking-soda

If it’s dog pee then this would work with a lot of water & overseeding.

If it’s fungus, then it won’t and you’ll need a fungicide.

If it’s pests, then you’ll need an insecticide.

Do you have a dog? Do you have grubs under the turf? Treating the cause of your turf damage is important to prevent further deterioration.

This product is fairly new, and I have not personally tried it. It may be worth investigating researching reviews and Q+As.

https://www.rustoleum.com/product-catalog/consumer-brands/renovator/grass-color-refresh

Here's one Hometalk post that might help - https://www.hometalk.com/diy/grow/fix-burnt-grass-dog-urine-spots-with-this-easy-solution-31084976

Fix Burnt Grass & Dog Urine Spots With This Easy Solution!

This tutorial might help: https://m.youtube.com/watch?v=ghzCial00e8

This might help: https://geckogreen.com/how-do-i-get-rid-brown-patches-my-lawn