Reddit, How do you make extra money? My goal is an extra $1000 per month

I am a commercial underwriter with several years of experience. I'm looking to buy our first home and want to put together a bigger down payment. Unfortunately a raise/promotion isn't likely in the near future and so I need to get creative.

How do fellow desk jockey redditors make money on the side? (legally)

Edit: I live in the US

Edit: Wow. Definitely didn't expect this level of response. I'd like to say thank you to everyone for the public and private replies.