Archaic KJV Word
Restore
Modern equivalent: repair
What Was Lost
The return to original glory. 'He restoreth my soul' did not mean God gave the psalmist a nap. It meant God returned his entire being to its original, intended state -- the state God designed before sin and brokenness distorted it. 'Restitution of all things' was the restoration of all creation to Eden's design.
Closest Survivor in Modern English
restore (still used but lacks the cosmic, all-creation-returning-to-Eden scope)
Peak Usage (1611)
KJV Psalm 23:3 -- 'He restoreth my soul'; Acts 3:21 -- 'The times of restitution of all things'
Died still used but minimized (~1900)
Hebrew shuv ('to cause to return/bring back to original state/reverse the damage') weakened into 'put back where it was' or 'renovate.' The cosmic restoration of all creation became home improvement.
What Replaced It
“fix”
Mechanical and limited; restore meant returning something to its original divine design
“renovate”
Cosmetic improvement; restoration was returning to the state God intended before the fall
“repair”
Functional fix; restoration was a complete return to original glory