Launching a newsletter is so hot nowadays, and you can use platforms like Substack, Beehiiv and Convertkit to start your newsletter.
You don’t have to launch a newsletter for sure.
You can also find newsletters related to your audience's interests.
LetterHunt and NewsletterSpy share a list of newsletters according to areas.
You can reach them to talk about partnerships and promoting your solution to their audience.
Before that, don’t forget to subscribe to their newsletter first. :)