I am new to this forum and want some guidance on my new project.

I am new to this forum and want some guidance on my new project. I am looking a suggestion as well as a guideline for design my website https://deltaexecutorapp.io/. This is a Roblox themed website, so I want to give it a gaming dark themed look. More specifically i want it to look more like a developer tool site, a very subtle professional product tool site but with a gaming effect. Since i am not a developer or designer, I have used Ai tool to design custom sections but I know those codes that I put in custom html widget in wordpress editor are not scalable nor is it the professional way to use or do code. I prompted AI tool to design a specific section and it did. but the way I did those do not seem to be following standard practices. So, I want a clear roadmap or guideline what and where I did wrong and what can we do to make it better. Is there any one who can design the website for me the right way?