Note: With version 10.28.1, the name of this feature on MetaMask Extension changed from reset account to clear activity and nonce data. Both perform the same function, but in this article, we'll use the MetaMask Extension terminology (clear activity and nonce data) to refer to them both.
You should only clear your account activity when strictly necessary, most often to resolve stuck and pending transactions. We do not recommend you reset your account unless one of our Support agents suggests you do so.
This function is intended primarily for developers, who may find it useful to clear an account's activity on a test network while continuing to use the same account.
Note that clearing account activity only affects the current network.
Before commencing, we recommend you download your state logs. This will allow our Support agents to troubleshoot the root cause if necessary. Clearing your activity is irreversible, and not a common requirement for most users.
You will not lose value in your accounts.
To reset the account:
Click the account icon in the top-right corner, and then go to Settings > Advanced.
Scroll down and click 'Clear activity and nonce data'.
Head to 'Settings' by clicking the hamburger icon, and then hit 'Advanced'.
Click the 'Reset account' button.