Salaam Shakir and Salaam to everyone
Fitra, from the form Fatara belongs to a family of related words i.e. Falaqa and Shaqqa:
Fitra-t to invent but for the first time.
Allah Fatara means Allah created the people and started them (for the first time).
Al-Fitra-t: Allah Fatara the creation means Allah brought entities into being and invented them in a form (like kneading the dough) trained for a particular way of action (behavior):
فِطۡرَتَ ٱللَّهِ ٱلَّتِى فَطَرَ ٱلنَّاسَ عَلَيۡہَاۚ
30:30. Allah‘s Handiwork, that which, Fatara people conformally (according to the design of the handiwork)
Allah’s Handiwork has focused and positioned the human nature to believe (in Tauhid (Divine Oneness))
Fatir is the grammatical agent of verb Fatara i.e. the Sunderer, the sunderer across the cosmos, the starter of all objects going through the cosmic-wide sunderance of singularity.
Q: What is Singularity?
A: A singularity separates realm A from realm B, where each realm are endowed with structures and rules for existence of the entities within them. There is no way the two realms could immix and if they could they both would have had perished. They can coexist since the singularity forbids them to commix in whatsoever way.
Example 1: A larva crosses the singularity of a cocoon to adopt new rules of motion i.e. rapid aerial flight abandoning the completely incompatible slow crawling motion on branches.
Example 2: Ice in solid form, suddenly becomes liquid.
Example 3: Our bodies are molecularly quite similar to other animals, however these bodies serve as singularities through which our being-ness translocated from the other realm of spirits to this corporeal realm.