If you make a mistake, kill an NPC accidentally (ruining your Moral Points), or experience a glitch: Close the game completely.
Remember.
%LOCALAPPDATA%\Packages\DeepSilver.MetroLastLightRedux_hmv7qcest37me\SystemAppData\wgs\ metro last light redux save game
Artyom stumbled, his breath fogging the cracked visor of his gas mask. The echo of a watchman’s howl faded into the dripping darkness of the cursed tunnels beneath D-6. He checked his magazine. Three rounds. His lighter flickered, threatening to die. If you make a mistake, kill an NPC