I could say you lack a menu in the upper part. Something like: how it works | assets | FAQs | ambassador (for the help build and crowdfunding part) | contact

Make it always centered in the green fixed bar - it will also be visible when scrolling/navigating on the website.

Branding wise would be that right beside the icon to put the brand name (plunda) - especially or at least when scrolling down.

Also, try to make your design more responsive in matter of background at least. It's nice to see the scroll down for more on a green background but right now I do see the gray part also... and maybe make the arrow clickable to begin with, yellow, bolder, bigger (like those on the join page) ?

Use a floating "back to top" button also.

The social media buttons in the lower part should align to the yellow/green/white&black color theme of your brand. You picked great colors, btw.

P.S.: I saw the day/night button on the join page, why not use it on the landing also?