Keep It Simple.
What is more important to you than your next breath?
Sutras on Breathfrom the Vigyan Bhairav Tantra
1.) Radiant One, this experience may dawn between two breaths.After breath comes in (down) and just before turning up (out) – the beneficence.
2.) As breath turns from down to up, and again as breath curves up to down – through both these turns, realize.
3.) Or, whenever in-breath and out-breath fuse, at this instant touch the energy-less, energy-filled center.
4.) Or, when breath is all out (up) and stopped of itself, or all in (down) and stopped -in such universal pause, one’s small self vanishes.This is difficult only for the impure.
5.) Attention between Eyebrows, let mind be before thought. Let form fill with breath essence to the top of the head and there shower as light.
6.) When in worldly activities, keep attention between two breaths, and so practicing, in a few days be born anew.
7.) With intangible breath in center of forehead, as this reaches the heart at the moment of sleep, have direction over dreams and over death itself.
8.) With utmost devotion, center on the two junctions of breath and know the knower.
9.) Lie down as dead. Enraged in wrath, stay so. Or stare without moving an eyelash. Or suck something and become the sucking.
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Some commentaries on these meditations are very revealing. Osho's is one of my favorites…
https://www.oshorajneesh.com/download/osho-books/Tantra/Vigyan_Bhairav_Tantra_Volume_1.pdf