Need help and advise on website load speed

I am having problems with my website lknights .com

The home page loads ok but could load a bit faster

I have 6 domains that are on Namecheap set up with a 301 redirect to pages on my website. All 6 domain names either take a very long time to load or don’t load at all.

Examples are JazzEvent .com and TV .services

I have made sure the page lin ks are correct.

On my website, I also have WP Rocket. I have cleared used CSS and caches but still no difference

Any advice would be greatly appreciated.