Hello! I'm also a full-time fiction ghostwriter, been on here since 2021. I completely agree, I think a dedicated thread for this subject is a great idea!
In response to your assorted hopes for this thread, I'm afraid I don't have any questions, nor do I have any particular tips. I've never run a single promotion, I don't have social media, and the order briefs drive me nuts :). I will say that I had quite a bit of fun putting together my gig descriptions, as well as my profile description, and I've had several people cite those as reasons they selected me (and I have my kids in my profile pic, which people seem to like), but that's about all I've got!
To conclude, I'm certainly happy to connect with people! At present, I don't really have any connections to other writers, professionally or personally, and would love to chat with people about the craft!