Hi Haiko, thanks for the nice feedback!
On your question: I think this model could still work, if you are able to relatively weigh your ideas & ambitions within the that one quadrant where things are going well and are controllable. As you seem to have trouble choosing where to invest your time, I bet not everything is going as well as you want? So there is a nice angle already….
But still, there are also plenty of other articles on productivity and setting your priorities on Medium, maybe you can find some inspiration there? I’m also planning another article on how to set my own priorities, on what to start and what to stop for instance. Stay tuned :)