The Book of Revelation was kinda like a revenge fantasy for early Christians experiencing persecution by the Greco-Roman empire.
The lake of fire was not for human souls.
While Revelation isn’t exactly the best source as you say, it still has this part regarding a lake of fire:
But the cowardly, the unbelieving, the vile, the murderers, the sexually immoral, those who practice magic arts, the idolaters and all liars—they will be consigned to the fiery lake of burning sulfur. This is the second death.
While Revelation isn’t exactly the best source as you say, it still has this part regarding a lake of fire:
Revelation 21:8 (NIV)