It's likely you misremember the passphrase/password of that wallet. At this point, people usually recommend you to remember parts/characteristic of your password and brute force using tool such as btcrecover[1]. It's most popular open since it support GPU usage and lots of wallet/cryptocurrency[2].

[1] https://github.com/3rdIteration/btcrecover/
[2] https://btcrecover.readthedocs.io/en/latest/