What is the Ultimate constituent of matter or the Ultimate Reality that would lead us to Theory of Everything?

We are Universe. Some of us are metaphysicists, some mystics, so yes, there is as much Universal 'search for reality' as there are 'people' (and whatever other species...) 'search for reality. Ultimately, every moment of Universal existence, is a unique moment of Universal Self Knowledge/experience!

Here is One (unchanging, ALL inclusive) Universal Reality/Self! Existence IS Self Knowledge, every single unique (Planck) moment! There is NEVER anything existing that is not the One All inclusive Reality/Truth!

One! Existence = the complete Universe = Nature = Reality = Consciousness = Truth = Love = 'Self!' = God = Brahman = Tao = ... etc.... ALL INCLUSIVE! 'One'!

To search for 'reality' is rather schizophrenic! Like the fish swimming off in search for water! Better to see how everything IS Reality, to affirm all!

"There are two paths leading to oneness with the Tao. The first in the path of acceptance. Affirm everyone and everything.

Freely extend your goodwill and virtue in every direction, regardless of circumstances. Embrace all things as part of the Harmonious Oneness, and then you will begin to perceive it. The second path is that of denial.

Recognize that everything you see and think is a falsehood, an illusion, a veil over the truth. Peel all the veils away, and you will arrive at the Oneness. Though these paths are entirely different, they will deliver you to the same place: spontaneous awareness of the Great Oneness." - Lao Tzu.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.