Hello,
I've come across your project and viewed your website. I can see where you want to go with it and that you want a point system. I can build this for you on WordPress with multiple plugins, the majority of them at no cost. The purchasing the points, that might require an extra cost as when I got to this stage it was tricky.
Due to the complexity of the point system and what you want to be done. I can do this within 7 days, I work on a shift rotation of mixed hours and can accommodate to your local time. Best would be emailed.
My experience is that I have worked with WordPress developing it more commercially since 2015 and programmed since 13. In 2016 I developed a web application on top of the WordPress Framework which had a membership/points/affiliation/advertising system all built in, also mobile responsiveness.
The plugins that we would be using is Ultimate Member, MyCred and Woo-Commerce, and probably a few smaller ones but these are the ones that would bring your point system and Woo, creating the purchasing, as well as the payment gateways.
There are a few other errors showing on the site, not 100% sure If I could fix them as its SQL which I do know but not sure about the Maria DB.
I wish I could show you this project and the way it worked but due to a personal circumstance, I deleted the project due to my daughter's custody case and the project being used against me. This is why I do not "showcase it".
Let me know what you think.