https://metamask.zendesk.com/hc/en-us/articles/360015488891-Resetting-an-Account
You will?not?lose value in your accounts.
To reset the account:
On Extension, click the account icon on the top-right corner. On Mobile, tap the hamburger icon in the top left to open the main menu.
Select?Settings
Select?Advanced?
Scroll down and clickReset Account