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 for suggestion as well as a guideline for design my website https://deltaexecutors.mx/. 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. I want a clear roadmap or guideline what and where I did wrong and what can we do to make it better. Is there anyone who can design the website for me the right way?