If an ad is generating 500% return on investment (ROI), increasing its budget two times may drop the ROI to half. Learn the difference between horizontal and vertical scaling, and how you can scale your ads without effecting the ROI.
Leaks: Users exit the funnel before moving to next phase. Bringing them back in the funnel just cost $ and can save $$$ of ad spending.
Your visitors would not submit a lead until they develop enough trust in your business. This blog lists simple yet clever things to boost their trust and generate more leads.