The story of how the LOTR movies got made is an under-rated miracle. Peter Jackson was a schlock horror indie dork with 1 serious movie on his resume (Heavenly Creatures) when he pitched the Lord of the Rings trilogy
He pulled in insanely talented VFX artists by basically saying "hey, want to work on Lord of the Rings?" He made the trilogy on a comparative shoe-string budget (less than $100 million per movie).
He was absolutely terrified of the movies crashing and burning so he kept close to the book (especially for the first movie). He thought "we need the existing fans to come, we have no hope of success without the fans".
Everything came together for the LOTR movies, from tech advances to financing to the perfect actors. It was a project of love from the perfect director who was in love with his island home which just so happened to be the best spot on Earth to stand in for Middle Earth.
If you believe in miracles, the LOTR movies were a miracle. Every perfect thing came together at the right moment with the right people.
Imagine what they would have done to LOTR movies if they were being made today
We got very lucky