Adjusting brightness (gamma) in option.txt is now removed in versions 1.19 and above (https://bugs.mojang.com/browse/MC-51418).
There is a purpose that we are allowed to alter the gamma up to 5.0 according to the Minecraft speedrun game rules, so i would like to see the possibility of adjusting game brightness (gamma) using mods, instead of using option.txt.
I am looking for mods SIMILAR TO (not this specific mod) this (https://www.curseforge.com/minecraft/mc-mods/boosted-brightness) for any speedrun

Gamma cannot be modified above 1.0 for version 1.19 to maintain vanilla parity, sorry.

aw that sucks a bit I guess....