First I'd look if there are any lists of plugins you could get it added to. Maybe there are directories you can submit to, or if you find such lists as blog posts, can try asking the author to add it.

Another way would be to share your learnings. If you make a good blog writeup about something you learned, you now have something shareable with a natural way to include a link to the project. I don't know anything about the IntelliJ community, but you could see where they hang out and what kinds of posts seem to do well. Maybe you can write something similar.