I just played around with your preview link and found myself experiencing dejavu… read here when I tried exactly what you’re attempting to do - I was unable to do it without using a convoluted workaround (by creating a series of delayed interactions that lasted over 5 minutes in total). Infinitely looping a series of interactions that involve more than one element is inherently difficult in Webflow (maybe impossible without custom code).
I do not recommend you try my solution, but I do have a simple alternative: make a 5 frame looping GIF then insert it into your website as an image. Because you are simply displaying colors, it will be small in size and will loop seamlessly.
If you don’t have experience making GIFs, just reply with the 5 hex colors & how long you want it to wait on each color, and I will make it for you to save you the trouble.