Do you want to be #1 on Google?
The simple things can have a big influence on search ranking...
1. SSL CERTIFICATE - Make sure you have a ssl certificate on all pages. Everybody feels safer when a website is secure, especially if you are selling anything. This is also true for all of the major search engines who are understood to give a little more ranking power to websites with a valid ssl certificate. A SSL certificate can usually be purchased from your hosting provider for less than $100 per year.
Secure site certificates are also available from discount brokerages at a significant discount (~$29). You can even get one for FREE from the company "Let's Encrypt." If you have a good hosting company, they may offer automatic Let's Encrypt certificates for free.
If you're serious about improving your search ranking, adding a ssl certificate is about the easiest thing you can do at any cost.