1. Contact all of the customers who have purchased from you in the past, but for some reason you no longer hear from or you haven’t called in a long time.
2. Ask every customer you have who else they know who could benefit from what you sell.
3. For people who are hard to reach, vary the time of day and the day of week you attempt to reach them.
4. Always remember the marketing holy grail – ‘Wiifm’ (What’s in it for me) and tell the customer clearly how you can help them.
5. Refer your customers to others who might benefit from doing business with them.
6. Use keywords in your emails to allow the reader to quickly identify the subject.
7. Use interest adjectives – avoid ‘nice’ or other bland words – use ‘sparkly’ words such as powerful, incredible, essential.
8. Don't work as an “unpaid consultant” in an attempt to close a deal. Ask your prospect if they will they buy from you if you do the additional work. If the response is not confident, walk away.
9. Test your strategies by asking colleagues to stand in for cold call strategies or review your email marketing content. If you can't convince your colleagues, you're unlikely to convince a cold customer who knows nothing about you.
10. Relax. Anxiety and fear moves the blood from the frontal cortex of your brain to the central region where your "fight or flight" impulses reside. Relaxing keeps the blood where it needs to be - in the front where awareness and decision making occur.

Sources

• http://thesaleshunter.com/resources/articles/sales-motivation/quick-tips-for-increasing-sales/
• http://www.agilemarketing.agency/10-quick-tips-for-writing-powerful-headlines-to-increase-sales/
• http://www.inc.com/barrett-riddleberger/5-quick-prep-tips-for-sales-call-success.html
• http://www.entrepreneur.com/article/82924
• http://www.forbes.com/sites/kathycaprino/2013/05/03/10-essential-selling-principles-most-salespeople-get-wrong/