Hi , As part time  marketer   .I think  the most reliable and sustainable way to get more customers  is "Word of mouth"   and alway there are lots of lucrative , free and unconventional way to  leverage this method .Thanks to Youtube you can have access to lots of great coaches  but Jay Baer is  the Yoda.

I put link of his channel here and I hope it helps you  

<a href="https://www.youtube.com/watch?v=mIDndLSA2vs&list=PLwEhUP5s3XQwhP5alTodcrAUT17Cc7ADm">https://www.youtube.com/watch?v=mIDndLSA2vs&list=PLwEhUP5s3XQwhP5alTodcrAUT17Cc7ADm</a>;

You can start with this funny story : 

<a href="https://www.youtube.com/watch?v=iS5NoGoXKbs&list=PLwEhUP5s3XQwhP5alTodcrAUT17Cc7ADm&index=10">https://www.youtube.com/watch?v=iS5NoGoXKbs&list=PLwEhUP5s3XQwhP5alTodcrAUT17Cc7ADm&index=10</a>;