Ask HN: How to find a sponsor?

Hello, I have a daily digest iOS app. Specifically focused on keeping you up to date on top news stories without spending hours. Think morning brew but more interactive / rich content.

I currently have great numbers for a newsletter type product. 3k Daily, 15k monthly and a 50% daily CTR. Young professionals in metro areas.

I really just need enough to pay to keep things running as it's mostly all automated. A few hundred a month.

Any suggestions on how to find a partner/sponsor?