What caused the cold Dark Matter Big Bang Black Hole to explode into inflation and equal sized Herbig Haro Black Holes for Star /Galaxy formation.

The Big Bang was the evaporation of the former Big Crunch String Black Hole singularity, A: into the oscillating Dark Energy based Axion String vacuum and 

B: the explosion into smaller String nuclei or Chunks called Dark Matter Black holes, able to form Herbig Haro system of two equal sized repelled Tadpole Black Holes with hot star formation and Jets in between, 

The start of the warm Inflation.
see: Primordial Black Holes and Dual Herbig Haro Effects for Star-Galaxy Formation
https://vixra.org/pdf/2101.0158v1.pdf

More in Detail:
The end of the universe: by the growing Big Crunch String Knot Black Hole. 

The resilient String Black Hole particles compressed by the diluting oscillating vacuum inside the growing Big Crunch String Knot Black Hole, is assumed to have reached equilibrium growing to explosion as the Cold String Knot Bg Bang into the dilute remaining vacuum space frame as A: new vacuum particles and B: as Dark Matter Black Holes of variable sizes self organizing as Tadpole BHs pushed by plasma tails, into Herbig Haro systems forming stars and galaxies in the center of both BHs connected by opposite Jets.
(Q-FFF Theory)

 

The Tadpole Black hole equipped with Plasma tail pushing away from mass concentrations and into opposing (stellar) winds. like Ball Lightning.

The new Physics miracle of Q-FFF Theory.: 

The Herbig Haro system as radio and x ray image . The star in the middle is connected by two Plasma Jets with both equal sized Bowshock Black Holes.