What should I do to atone for the sin of depositing one hundred thousand Egyptian pounds into a current bank account, knowing that it was unlawful, and after the balance has been depleted?

The ruling on a current account in usurious banks is that it is impermissible except in cases of extreme necessity, such as fear of theft or loss, and the absence of an alternative. This is because it is considered an aid to the bank in its usury, and because the bank benefits from these funds in its usurious transactions. The duty is to repent from this transaction by feeling remorse, seeking forgiveness, and resolving not to return to it.