There are multiple different angles to answer this question. I will start with a few clarifying questions first.

Who do you currently sell to? (industry, companies, individuals in those companies, etc)
What is your current sales process?
Where do you get traffic from? (digitally, phone, in person, etc)

There are only 3 ways in increase revenues in a company via sales. Get more customers, get them to come back more often, or sell them more things.

If you currently have maxed out your highest revenue channels, you would need to open a new channel, thus a new form of sales professional to step into that role. If you have not yet maxed it out, you would need someone with experience in maximizing that channel. This could mean hiring an industry leading sales person, or maybe a facebook ads expert or agency if that's your core means of sales.

Since you have a broad question, I can't give you a definitive answer but this may help get your head pointed in the right direction.

(quick note on the site, when you click purchase report, it takes you to a login screen. That presumes #1 that any user is already a member (at a min it should be a simple sign up as default not log in) and 2 that is a friction point in sales, the reality is you could capture an account on checkout for those folks that just want to buy a single report. make that as easy and as simple as possible and sales on the main page will increase.