Unhappy at work / conflict with impossible goal

* My impossible goal was to make $100 000 in my own business (replace my job income as an entrepreneur).
* Part of the motivation is to leave my job in a year
* Brooke always says don’t leave your job If you think it makes you unhappy.
* Is it pointless to even work towards this impossible goal of replacing my job income if I shouldn’t be leaving my job anyway (because I’m unhappy)?