Ok for those who say the maps look "VERY DARK" And it's because everyone who said that is absolutely right 😂
Here are a few temporary solutions 👍 (That personally worked for me and it depends on each person if it worked for them or not ☝🤓)
1- The first thing is to INCREASE THE BRIGHTNESS from the game options ✅
2- Subscribe to this mod called "(VScript) Increase Map Lighting"
LINK: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3478564648
What this mod will do is increase the lighting of all maps, going from dark maps (like this mod) giving all maps more lighting and more brightness (You can see the screenshots of the mod to see the difference) ✅

3- ⚠ This depends on your own tastes ⚠ but you can add mods of Visual Lighting
For example, I use
- Cinematic Lighting Effects and Enhanced Lighting Effects
LINK: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3326932328
- Map Specific Waters:
LINK: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3360305524
- Informal Skyboxes:
LINK: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=121090376

All of this combined completely changes the game's atmosphere (and these mods don't conflict with each other).
But if you're just looking to solve the problem of darkness in the maps, just do the first two steps and that's it.

And just in case, I'll leave you a post where you can also solve an issue in the game itself where all maps look DARK even without any mod (You can also add this if you do the step 1 and 2) only if they present the problem
LINK: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=954836428

There is also another mod called "HD Air" Color Correction (All Campaigns)" that I personally DO NOT USE because if I'm not mistaken, this mod conflicts with one of the mods I use. However, if you ask me, I WOULD NOT RECOMMEND IT because the mod is outdated and the correction isn't adequate in certain campaigns (but if you'd like to try it, go ahead).

Well, that's all I have to say. Personally, all of this helped me and changed my maps.
On maps like the last one, "Death Toll," where I was passing a burning barrel, I stood still and everything looked very dark. After doing the 2 steps, things look better now. On the first one, "Dead Air," it looked very dark, and now I can see better.