The default Ardor passphrase consists of 12 random English words out of a 1600+ words dictionary. This is impossible to crack by brute forcing. Only if you think you made a small typo, or if you forgot for example 1 of the 12 words, it might be possible to find the correct passphrase by brute forcing it. Some community members made tools for this, for example https://ardor.tools/typo/typo.html (which needs the public key) and Ardor itself provides a basic password recovery tool Passphrase_Recovery. You can also ask for help in ardorforum.org or the Ardor Slack chat.