My issue has been resolved today:
1. After 10 days of communication with Vercel, the platform has unblocked my account and websites, and provided the specific explanation I expected.
2. One of my websites remains blocked because a page on it has a DMCA issue, while the other websites have been unblocked.
3. Over these 10 days, I have migrated some of my websites to Cloudflare, which was not an easy process. Technically, it involved migrating from Next.js to Open Next.js, requiring modifications and testing of a significant amount of code.
4. If anyone is interested, I can share my experience with the technical migration as well as the communication process with Vercel.
5. I would like to express my gratitude for everyone's suggestions at all times.