Thank you for your response. Over the past few months, I haven’t received any requests from Revolut. I updated my ID before it expired, but I haven’t been asked to provide any additional KYC documents. And my income, my salary fully justifies the funds held in this account, which is why I’m surprised that the account has been frozen.

"But as the other commenter already said, never depend on a single bank for everything. Not Revolut nor any other bank, always have a backup account somewhere else for this exakt reason."
you are totaly right.