you need to have some idea of what your password is.
- for example you should know how long it was,
- what type of characters you used (upper case, lower case, symbols)
- it helps if you have a list of possible words you used in your password (e.g. Bitcoinpower100)
- generally anything that narrows that the list of possible passwords to check.
then you can use a tool like this:
https://github.com/gurnec/btcrecover