I went to read the post that you mentioned and I couldn't agree more. :)
Hmm I personally haven't thought so much about this whole thing because I am not really a social media person and public relations is definitely not my strength. I am not sure if this could be a tip, but I read quite widely on Hive and if I find interesting posts, I would upvote and/or comment. (Fun fact, I actually spend much more time reading/curating posts than writing my posts.) Sometimes, one gets to know more people this way and that's also how I found new communities like Weekend Experiences!
Reading other people's posts and commenting on them us a legitimate way to attract people. Once they're attracted though, we need to keep them interested and that's not always easy. It seems like you're on the right track though.