It really varies depending on how many books you sell, how you price your books, and what percentage of each book sale you get in royalties.
Some sources say that the average earning for a self-published author is around $1,000-$2,000 per year. However, it's important to remember that the vast majority of self-published authors don't earn a full-time living from their writing.
If you're looking to make a significant income from self-publishing, you'll need to be strategic about it. This means publishing multiple books (preferably in a series), pricing your books at a point that will allow you to make a decent profit per book, and promoting your books effectively.
There are a number of ways to promote your books, including:
-Paying for advertising on social media or other book-related websites
-Doing targeted marketing and PR campaigns
-Getting involved in online and offline book communities
-Doing speaking engagements and other events
There are a number of helpful guides and resources out there on how to make money from self-publishing, so it's definitely worth doing some research if you're looking to maximize your earnings.