Reset your account
If you can't use one or more of your MetaMask account's features, you can reset your account. To accomplish this, navigate to your account's "advanced settings" and select the "reset account" option.
Restore the account
If, despite entering the correct MetaMask login password, you are still unable to access your account, you can restore it by using the secret recovery phrase. This can be done quickly and easily from the portal's main page by selecting "restore your wallet" and following the on-screen instructions.
Check the status of the MetaMask website
If the MetaMask website is down or undergoing any kind of maintenance, you may not be able to log in regardless of what you do. Therefore, the first thing you need to do is sit tight and allow the MetaMask servers to restart. After that, you can try logging in using the appropriate MetaMask login information.
Conclusion:
Whether the issue is with the MetaMask website itself or the MetaMask account login, it can be easily resolved by following the straightforward instructions provided here. Just make sure you have patience when dealing with such a problem. In any other case, you might never be able to get your account back.