The Fastest Way Is To Change Some Values In Encryption Algorithm

For constant protection, you could change the constant in here and here

If you want more modification, you could replace the encryption algorithm completely

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Plugins Are Used To Provide More Protection In Confuserex

You could create a plugin by referencing Confuser.Core.dll in your project and inherit the class Protection or Packer.

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Providing A Seed Ensures The Output Does Not Change Each Time You Obfuscate

It is helpful to find bugs in protection

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Strong Name Key Is Usually Used To Ensure The Identity Of The Author

It has no effect in protection strength

Although some protector validate the strong name key in protection, ConfuserEx provides no such functionality as it can be defeated easily most of time.