Fix Legacy Ethereum DApp – Node.js Expert & Fullstack Dev Needed

Description

I developed a decentralized Rock-Paper-Scissors betting game on the Ethereum blockchain about 4 years ago. Recently, I tried to run the project again to integrate it into a betting platform - but ran into several issues.
I attempted to fix the errors myself, but I’m not an expert in Node.js or fullstack development, so I wasn't successful. Now I'm looking for a senior developer to help me bring this project back to life.
The more I try to fix things, the more errors I run into - and honestly, I don't fully understand what's going wrong. I could really use your help. I believe this will be a relatively easy task for an experienced developer.
This could also turn into a long-term opportunity. I'm looking forward to working with a skilled and thoughtful developer who can make things clear and work efficiently.
Please send me a screenshot of the working first page when fixed. Check my screenshot.