One time offers
A great strategy that many product owners use to maximise their profits is the concept of one time offers which involves offering an extra product or service after each customer has placed an order. If the one time offer is closely related to the original offer it will have high conversion rates.
A simple way to implement this strategy is to use resell rights products which are related to what you are selling as you can immediately set up it up once you have obtained them. It can either be one product on its own or a collection of related products that customers will be interested in.