Why are you wasting your time?
Time after time a question that could solve most, if not all, of our problems would be simply: Why?
Contrary to the Simon Sinek approach that relates to a higher purpose (which is also very valuable), this is literally asking you,
"Why are you doing this? What did you anticipate would happen if you took that action?"
In hindsight, we often find out that we had no real strategy before we started off on our ventures.
The interesting thing to consider is that we don't always have to know what we're doing, but we should be conscious of that fact and be clear about what we're hoping to learn from the process itself, even if it the answer is vague. Let's be able to state that, "Yes, it is true I don't know what I'm doing. I know that."
Or when people ask you why you're trying 100 jobs, you can say, "I don't know what I want so I'm dabbling in order to figure that out," or "I ran out of good ideas so I'm just going with the flow. I'm trying shit out to see what sticks."
This helps avoid a lot of the denial and self-delusion we put ourselves through. It also gets us in the habit of leading with honesty and clarity even when we're uncertain.
We should be able to at any given moment check in and ask, "Why are we spending time on this? What do we think is going to happen as result?"
Hearing your answers will give you an immense amount of insight into your equation for success which many times is broken. People have the steps backwards (e.g. getting paid speaking gigs from day one) or don't understand what you must build in phase one to execute phase two.
Jumping the gun is also quite common as is never-ending procrastination.
Again, you don't need to have all the answers, but checking in and asking why the hell you're taking a given action can give you a lot of clarity around what you believe will garnish results. Match that up against more experienced folks (proven models of success) and save yourself a lot of wasted effort.