Probably, you are doing these errors:

You don’t remind people to come back and visit.
People usually don’t purchase the first time they visit.
The more times they visit your site, the greater the
chance they will buy. The most effective way is to give
them a free subscription to your e-zine.

You don’t make people feel safe when they order.
Remind people that they are ordering through a secure
server. Tell them you won’t sell their e-mail address
and all their information will be kept confidential.

You don’t give people as many ordering options as
possible. Accept credit cards, checks, money orders,
and other forms of electronic payments. Take orders
by phone, e-mail, web site, fax, mail, etc.

You don’t let people know anything about your
business. They will feel more comfortable if they know
who they are buying from. Publish a section called
“About Us” on your web site. Include your business
history, profile of employees, contact information etc.

You don’t make your ad copy attractive. Your ad
lists features instead of benefits. The headline does
not attract at your target audience. You don’t list any
testimonials or guarantees included in your ad.

You don’t let people read your ad before they get
your freebie. When you use free stuff to lure people
to your web site include it below your ad copy or on
another web page. If you list the freebie above your
ad they may never look to see what you’re selling.

You don’t make your web site look professional.
You want to have your own domain name. Your web
site should be easy to navigate through. The graphics
should be related to the theme of your web site.

You don’t attract the target audience that would
buy your product or service. A simple way to do
this is to survey your existing customers to see what
attracted them to buy. This information will help
you improve your target marketing and advertising.

If you desire to grow your business and make more sales, I recommend you to consider a strategic business consulting firm.