analyze it the way you would if someone else had written it

Personal experience suggests this is freakishly hard without a lot of practice, which can mostly be obtained by writing up your introspection for public consumption and getting good, honest feedback. This typically results in improved writing skill. (I can't say for sure it directly results in introspective skill if you're not doing it primarily with that purpose in mind.)

I'd be genuinely curious to know, did that come easy for you before you started writing for an audience?

I'll hazard one reason why the later posts in your sequence are maybe not having as much success as you were expecting: as I see it, you're failing to follow through on an implicit promise made by the introductory post, which stated "I've made it a project to increase my luminosity as much as possible", implying that you would be recounting personal experience with these various tools.

The Grue post had some personal insights, such as that you hate surprises. Let There Be Light had some tips from personal experience. The ABCs had none, and used mostly the "you" form for introducing examples. It's something of a paradox for a sequence on luminosity to disclose so little about yourself.