I don't see any mention of you not having your SEED. If you do have the seed just create a new wallet and it will automatically be unencrypted. Had to throw this out there since I saw no mention of the seed.
Thanks for your reply, unfortunately I do not have a SEED, just used a passphrase to encrypt my wallet.
Cheers!
If you are using a desktop wallet, it's fine if you forgot your password as SEED is the only need to access your wallet but in here you don't have any backup of your SEED. What wallet are you using? It's a basic thing to do backup of the seeds

I once encountered a thread here that he lost his passphrase, in this case, Electrum. One person do bruteforce to his wallet.dat and able to crack it adn recover the funds. Although in this case, the password was tagged as an easy one. Just don't have an idea how to do bruteforce on your wallet or is it still effective.