Short, simple but profitable advice.
Focus and attempt to master these 2 areas:
Front end selling. How best to acquire new customers.
Back end selling. How best to turn them into repeat customers.
Divide everything you do into these 2 categories. Master these 2 areas. How do these 2 areas operate within what you're doing now?
Yes, these are bare bone marketing fundamentals, but focusing and splitting everything you do into these 2 areas gives you a clear map of targets that will help you thrive.