What I first did was redeploy the project and repurchase the domain rpcide.cloud. I previously had the API deployed on Vercel, but I decided to migrate it to my personal VPS, and now it works much better.
I structured the domains in the following way: I created a striking landing page on the domain rpcide.cloud using Astro, and I think it turned out very nice and modern.
The application is now on the app.rpcide.cloud domain. I'm currently making interface changes, tweaking the colors a bit since the old ones seem a little ugly to me.
The next steps are to improve the app's graphical interface to make the colors look more consistent. This is how the app looked the last time I made a change to the project, which was over a year ago.
My idea is to improve this project so that it can be used in schools and universities for teaching, and of course for competitive programming competitions. I will do this by developing a specialized module for education, with useful tools for both teachers and students.