How do I know that my sales campaign is successful?

There are a few key metrics you can use to determine whether your sales campaign is successful. Here are a few suggestions:

1. Return on Investment (ROI)
2. Cost Per Click (CPC)
3. Cost Per Acquisition (CPA)
4. Cost Per Lead (CPL)
5. Return On Ad Spend (ROAS)
6. Conversion Rate
7. Sales Volume
8. Click through Rate
9. Website Visits

Note: Remember that different campaigns may have different goals, so the metrics you use to determine success will depend on your specific objectives.