You are commiting category error. "Why are we here/why does anything exist" implicitly assumes an impetus, a do-er with motivations. And "what IS this reality" contains it's own answer(and the refusal to accept it): It is 'this reality'. It is IS-ness itself. It's like saying "Perfectly describe the entirety of Moby Dick, leaving out not a single word or punctuation", and refusing when someone hands you the book.
Buddhism, Yoga, the more esoteric parts of the Abrahamic religions and many more all have you covered with an extensive corpus if you want people who are asking the same questions you are.
There's a Paul Graham essay I happen to have read just the other day about this topic. In it, he refers to this concept as "ambient thought", though I've found the title, "The Top Idea in Your Mind" to be a more sticky "motto" to remind me of the concept.
This is what came to mind for me reading the article as well: The difference between juggling, rotating, feeling out a thousand puzzle pieces that either fit or don't fit the well-defined hole you have, versus having the hole, having the puzzle-piece-'blank' that you're very slowly and deliberately chipping away at, sanding down, until it fits(as you know from the very start it will).
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