I’m looking for someone who can clean up and properly structure my small WordPress website

Someone removed the previous Astra themes and installed a very plain replacement theme for me. I didn’t like the result, so I started modifying it myself and continued building on top of it. The site basically works, but over time the setup has become technically unstable. HTML, CSS and JavaScript are contained in a sensitive custom code block, and WordPress sometimes reformats parts of the code as normal text, inserting tags. As a result, the code gets corrupted or conflicts with the editor, the page can suddenly appear broken, and I can no longer edit it safely. In short: the content and functionality are there, but the technical structure needs to be cleaned up, separated properly, and made stable and editable again.