Just a few unobtrusive ways to organically advertise a community:
Mention it in adjacent communities.
Cross-post posts from it onto related pages and be sure to watermark OC and link to the original post.
Link to the community on other social media pages.
Engage with every post and comment your community receives. People will be more likely to return to a community where they think they'll get interaction and feedback for their engagement.
Reposting with better formatting though (no blank lines in between bullet points)
Mention it in adjacent communities.
Cross-post posts from it onto related pages and be sure to watermark OC and link to the original post.
Link to the community on other social media pages.
Engage with every post and comment your community receives. People will be more likely to return to a community where they think they'll get interaction and feedback for their engagement.
I created one about alcoholism. Because it was one subreddit I saw a very warm and supportive community back in my reddit days. As it's a problem that's affecting more and more people of all ages and genders, I would really like to pull this kind of community to Lemmy.
Others have mentioned this but I'd like to specifically emphasize crossposting. It's really only reasonable to post in the promo subs when you first get started and maybe after a significant change but you can and should continuously crosspost to relevant communities.
I would also suggest mentioning your community on other parts of the fediverse as the microblogging folks are just as capable of contributing.