Keep people at your web site for as long as possible. Allow them to download free e-books, sign up for contests, use free online services, etc. This will help increase your sales. You could use pop-up pages, pop-under pages and exit pages too.
But be warned, this can annoy some visitors.
Anticipate any objections your visitors may have about your product’s offer. You must research your target audience’s needs and wants. For example, your target audience may not like businesses that use free web site domains. Another example, they may not like to buy from web sites that don’t accept offline checks.