If you have forgotten your wallet password, you need to first take stock:
1. What wallet software am I using?
2. Do I have access to a recovery seed?
3. Do I have a saved copy of the un-encrypted wallet?
If you answer any of these questions in the affirmative, there is hope of recovery.
If none of the previous prompts apply to you, it is important to understand that wallet passwords can not be reset by us or any other party. If you have a general idea of what your password may have been, you may want to try a third party service such as walletrecoveryservices.com, who specialize in trying to brute force these accounts for a share of the recovered funds.
If you have no idea what your password may have been, and none of the previous prompts apply to you, I am sorry to say there is nothing to be done, your wallet is encrypted within the highest standards of cryptography.