... I like the conversation to be strictly about photography.
Don't limit yourself. I've learned stuff applicable to photography from reading about dance and sport - two things I have no interest in doing.
Dave, this is interesting. Please explain in more detail/with examples. To me "the way you approach things" sounds a lot like the thinking of direction, evaluation of results, of what and why. For me just doing means what I would call playful doodling - an important part for me. The self-doubt to me is an unrelated matter. I think anybody who wishes to accomplish something must learn to live with repeated bouts of self-doubt, regardless the route you follow.
Playful doodling is kind of what I'm on about.

Twyla Tharp in
The Creative Habit (recommened reading) outlines a strategy for breaking a block by setting out a random number of coins on a surface and making arrangements with them. "Eventually, I land on an arrangement that feels like a musical chord resolving. I look at the coins and they cry out, "This is us." There in a nutshell is the essence of creativity: There are a number of possibilities, but only one solution looks
inevitable."
If all you do is carry on doing what you are already doing you'll make what you are already making. Some people are quite content to do that once they have arrived at a certain point in their development. There are people on here who, essentially, keep on taking the same photograph. They think that because the light is subtly different or the clouds have moved they are making new pictures, but they're not.
So the first thing required is a sense that you need to produce something different.
You could sit down and think out what that might be. I find that leads to boring results which aren't worth pursuing. It might not for other people though.Or you could try random stuff and see where it leads. If the latter then you need to develop strategies. Maybe
Oblique Strategies. (Refresh the page for a new strategy.

)
One photographic strategy I use when I feel like I'm in a rut is to limit myself to one randomly chosen lens. Another is to take photos without looking through the viewfinder. The crucial thing is to be alert for when something has occurred which can be developed with some thought. Sometimes that will happen when not actively searching for a new direction. To me this is what inspiration is - spotting something useful.
If you want an example of how I approach things this thread might be worth a look.
https://www.talkphotography.co.uk/threads/autoflora-evolution-of-a-project.579409/