I’m officially a published author.. but now what??

**I haven’t included the name of my book because I don’t want anyone thinking this is to advertise**

I recently self-published a book and I’m completely lost on marketing ideas that aren’t expensive. Does anyone have experience or any ideas on what I can do?

***Update: the book is called confusion and the cover is of a river. And I will definitely take the advice of going to a book store and handing out copies! That’s a great idea! And to answer the question about self-publishing, you can look up bookbaby or do it on Amazon for free.