Not able to login what should I do 
Follow these steps: https://bitwarden.com/help/forgot-master-password/
Unfortunately, you may be locked out if none of these options work for you.
Are you logged out on all devices and clients, or do you have any instance of Bitwarden that is locked? If you have a locked vault, there are certain conditions in which you may be able to use brute-force guessing to crack it. The main requirements are that you have access to a local copy of the data.json file, and that the master password entropy is low.