I have done zero advertising. If your book makes sense and is written from someone whose first language is English, then you got something... This is my 6 week's royalty. I only have 2 books out. Will be adding more. 1. Find a good writer, sometimes it'll cost a bit more, but in the end, it'll worth it. 2. Find a good graphic's designer for the book cover. 3. Hire a good editor to look through the book. I'll update periodically. There won't be a daily update from me because this is a snail method. If you're looking for writers, PM me.
What kept you from having 20 books or even more? It seems that you found something that works for you so stop wasting your time and scale this up as much as possible. Good luck!
