First, you make a roux. No, seriously, you’re going to need the carbs.
Add the trinity (onions, bell pepper, and celery.) Invoke the Trinity (JMJ), and anoint the router with holy water while you pray for internet speeds capable of running remote SAS.
Bring your committee members the pralines you didn’t eat (a dozen for you leaves one each for them.)
Go for another walk. Walking clears your mind so that inspiration can hit. Sometimes inspiration is the realization that you need to run a t-test instead of simultaneous equations, or that you need a difference-in-difference design and a new hypothesis. Or not.
Realize that no first draft is ever much good. Feedback may sting like an acid peel, but your paper will benefit from it, just as your skin does.
Click the send button and wait. This is the hardest part.