Redesign website to get more responses

Hi
We manage a small website at https://www.abetterme.online/
It is aimed at people who want to improve themselves and it sells video training courses on assertiveness, time management, etc.
It does what we want technically but it lacks any appeal for users, so although we are getting traffic to it, no-one is buying.
We are capable technically, but we aren't designers.
At present, the PC version is up and running but the mobile version needs a few fixes which we're working on.
So if you give us PSD images we can convert them to working pages - responsive, parallax, etc.
How much would you want to redesign the existing site to give it the WOW factor it needs - responsive, for mobile, tablet and PC.
We are happy with the logo and the green/purple color scheme.
Thanks
Steve