E-mail can't be sent continuously. Promotion should be done every day without interruption. See different people in other ways.

Have a plenty of opportunities, have a plenty of methods, have a plenty of persistence and variety.

For example, one of my long-term clients met through others. The customer is from Japan. He is my friend's China student. Once playing with friends, I happened to meet his student, who happened to be the boss of a foreign trade company. Because of my friend's recommendation, I handed him a business card, thus forming our business relationship.

Confidence is for yourself, and no one can give it to you.