Plant seeds at every opportunity

Not every customer is going to buy from you today. We all know that. But give them the opportunity to do so.

Believe that they will buy now and behave accordingly. At worst, make sure the experience is engaging enough for the customer that if he/she doesn't buy today they will want to buy from you in the future.

Sales is a math game. The more effort you put into actually selling stuff, the more success you will enjoy.