Once all tests are exhausted, realize there is absolutely no test you can perform that can tell you whether or not you’re dreaming. You truly do not know. Explore the world while holding on to this state of mind.
I've just felt like doing this second part of the exercise, so I performed it spontaneously a few times lately and I've had this lucid where I just knew I was dreaming and felt more "present" than usually. I think it might be related to the exercises for two reasons: I was having one lucid every two weeks but I've had two lucids this week while doing the exercises a little bit, and that feeling of "present" I didn't have for a while.