Only if you want it to succeed.
The fact is, no matter how good your story is, your writing is, your characters are... no matter how good it all comes together... if people don't know it exists, they simply won't buy it. You can't buy something if you don't even know it's out there. And you can't just hope they'll 'find it' or 'stumble across it' - there's literally millions of books out there, waiting to be found. It's up to you (or to us) to get your name out there in front of your potential readers.