i have just found an old electrum wallet with Bitcoin in it, what is the best way to brute force the password? i sorta know what it might be but nothing i have tried is working......
It is best to check coins in that file before wasting your time discovering the password.
Also instead of giving the entire wallet data to a third party, I suggest you use ---->
https://github.com/gurnec/btcrecover/blob/master/docs/Extract_Scripts.md (test password without having full access)