Provide one piece of advice to improve SaaS website for retail pos software company

If you can provide just one piece of advice to improve my web site (https://phppointofsale.com) that would be great!

It can be anything (Design, content, layout, look...etc)

I would be forever grateful for feedback. It is hard for me to critique as I am so close to it and I figured a community of hackers would have a fresh look.

if you would like me to do the same for your website/product let me know and I would be more than happy to.

Thank you,

Chris