Oh wait,
You said book singular not you have several books.
My advice is a bit different for that case.
Do not worry about advertising.
Do not go free with one book.
Wait until you have more to offer your potential readers.
The sad reality is that you might have the greatest book ever but if you have nothing to offer after the reader has finished your first one you will be nothing more than a distant memory. They won't keep checking back but will go on to either the next great author or back to a standby they know is good and reliable.
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