Thats weird. I self advertise too and I never got trouble. Doing this for 3 years now.

Hey there! I'm opening an ad shop atm and although it's still pretty new, I've been collating all my successful ads. I haven't received negative feedback so far (mostly positive). Usually, I like to search for stories with related tags, like angst, romance, and then advertise on walls of readers who may like that type of story. I also read everyone's personal messages before I post on their walls and check their acceptance to ads in general. It's a lot of hard work and even after all this, there's no 100% guaranteed chance they'll check your thread, but I believe quality work will find its quality readers in the end. If you can, I think it's great if you persevere because self-advertisement really adds that personal interaction with your readers imo, but you can always request at my shop if you'd like additional ads. I'll try to accommodate to your needs and wants and of course, ensure the quality is stellar.
If you really want to make sure I'm actually a reliable person, you can check this story's main page (BUT it's rated M- if you don't mind you can just read the main page where the credits are): https://www.asianfanfics.com/story/view/1244603/ The author left me a really kind thank you message. Or if you want to check my success rate in general you can also ask me for the statistics I've collated. I won't guarantee 100% success rate (because I can't be sure I'll succeed all the time), but I'll make sure every ad I make is of high quality.
This is probably some really shameless self-advertisement on my part HAHA (that's how advertisers must be ; u ;) But if you would like to know other good ad shops (other than my own probably-biased side), I can't exactly recommend you one because I don't really request for ads anymore, and I haven't met a shop that produces really stellar (no pun intended) results yet. There are many other shops that get the job done quickly, like Photography Babe Advertisement Shop (check the main page and from the many upvotes and comments, it's rather reliable imo), and I've seen Mystic Multi Shop as well. Sorry this comment turned out so long lol, but all the best for your story! I've seen your ad on my wall and I'll try to read it when I can and maybe give you feedback. :)

My advertisement shop is closed, but I will advertise walls if you'd like. Write now my shop is a one-shot/graphics shop. It has all of the batches I've done. A total of 8 and ten per batch. I've always gotten things done within a week~ If you'd like to request, I can send you the form. I'd be more than willing to advertise your stories. :)