What is most important for the success of digital marketing?

• Bottom Line Profitability Percentage. When you are contracted by a customer, they need to see an increase in their profits. 
• Lead Sources. You should find out where your sales are coming from. 
• Time Invested In Project Vs. 
• Cost per Acquisition. 
• The Average Cost per Lead. 
• Lead Conversion. 
• Social Media Engagement. 
• Lifetime Customer Value. 
• Goal Completions.