If you are not successful with a text editor, then I would recommend that you try to remember the way BTC got into that wallet, because every transaction is visible on the blockchain. Try to remember one of the following :
- Have you ever bought BTC via crypto exchange? Log in and check your transactions.
- Do you have any of your addresses saved in text format, e-mail or cloud?
- Try to remember your password, it may be similar to the ones you use today - people are often slaves to habits.
- You can always try this service, a man has a great reputation, and you only pay if he manages to unlock your wallet.