Try to guess the password - there is no limit, you can try as often as you want.
I cannot guide you through data extraction all the way, just do some research. Lookout for a working jailbreak fo your OS version or other software letting you access the data storage directly. Start with iMazing which is probably the most easy to use one and if it does not work try another software...
If it is your phone, it should not be that difficult to get all the way through to the app data. If you are lucky, you may find the private key file. But I would not be surprised if that one is encrypted by the app as well ...
In case there is a slight chance, try all passwords you have ever used first ... as said, you can try as often as you want - there is NO auto-delete or such on imToken.