I'll look into updating my mods when website stops fking dying

This does nothing by itself.
This does things now! Read this carefully as it edits your save in the process of usage.

First of all, use this mod: Lua's Auto Profile Backup (Updated) or don't complain later about something going terribly wrong. I've used this helper for a week or so multiple months, and it works as expected.

This tool allows you to stockpile weapon mastery exp and use it for your own prestige purposes (read on Suggested Usage tab what I use it for).
Why does exp needs to be stockpiled? Well, by default ALL exp in the game is limited to 5100. So you you hit 20k shots with M4 you still will have only 5.1k exp.

1. Pick up and process following files:
   1. /config/config.json where the mod can be configured
   2. /config/savedData.json where your prestiging progress is saved
   3. Aki_Data/Server/database/globals.json where SPT stores Mastery Levels for weapons in-game
      1. You can overwrite exp needed for weapons, example is in config.
2. Move all exp that you have above mastery level 3 (so excess exp) to savedData.json, in the process doing following
   1. Remove it from your save
   2. If you have enough exp stored to prestige, it'll tell you about it and consume exp needed from your saved exp

Cool news is that it reads required mastery data from SPT files so it should be backwards and forward compatible between versions as long as data structure in your save and SPT globals.json is not changed
It's an executable (not just a mod). It doesn't do anything until you run it.

DO NOT RUN Prestige.exe at same time when sever/game is running, it may not record the changes properly since profile file is in use by server.
First of all you have to sort out config, you have to grab your profile id (it's by default same as you save name that can be found in /user/profiles), and put it in config so tool knows what to grab. Sorry you all multi-profile gamers, it's manual. If someone wants to make it automatic feel free to make a PR on GitHub, I'm not interested in doing it myself.
After you done that, just run Prestige.exe and it should pop up the window that looks like on screenshots before. Then just follow instructions.
When starting you probably will have to run this a couple of times to go through all of your stockpiled profile exp. I didn't make it recursive, it prestiges things max 1 time per app run. After initial prestiging is done, just run this thing every now and then. I usually run it once per day if I play SPT.

This is how I use this tool with combination of my imagination and a bunch of other mods:
(Also, to prestige any skill to next level there must be at least 2 more skills on same prestige level as it is.)

• Weapons Mastery:
  • +-1% modifier in the weapon mastery group in 2 stats of my choice, and global +-1% modifier in 1 guns stats made with Weapons And Attachments Customizer
  • Double bonus for 1st prestige so you want to spread out and level multiple weapons.
• Skills:
  • Metabolism: +10 max food/drink, +5hp in one bodypart, hydration and energy loss rate -10% (all done with KMC Server Value Modifier (SVM))
  • Perception and Search: LooseLoot +10% all loot modifiers (more loot spawns, done with Lots of Loot),
  • Immunity: all negative effects from food/stims have 20% less chance of triggering (done with Negative Effects Chance), +5hp in one bodypart (done with KMC Server Value Modifier (SVM))
  • Recoil Control: -5% Recoil Intensity, -10% Horisontal rec mult, +10% Convergence Curve Multiplier (done with Fontaine's Recoil Overhaul)
  • Aim Drills: -5% Recoil Intensity, -0.02 Recoil Climb Multiplier, -10% Dispersion Recoil Multiplier, -20% Sway Intensity (done with Fontaine's Recoil Overhaul)
  • Health: Hydration and Energy rate: -10%, +2hp in all bodyparts (both done with KMC Server Value Modifier (SVM))
  • Strength: weight limits +20%, +5hp in 1 bodypart (done with KMC Server Value Modifier (SVM) and Weight Tweaker )
  • Endurance: stamina + 20, +1hp in thorax, arms, legs (both done with KMC Server Value Modifier (SVM))
  • Attention: -20% search time (done with Fast-Forward Search (FFS))
  • Memory: tripple "any skill prestige bonuses" in SkillFreshPoints, SkillPointsBeforeFatigue, SkillFatigueReset (outlined below)
  • Search: -20% search time (done with Fast-Forward Search (FFS))
  • Mag Drills: Round Load/Unload Speed -20%, bullets in ammo stacks: +25% (done with KMC Server Value Modifier (SVM))
  • Weapon Maintenance: -15% weapon durability burn (done with Weapons And Attachments Customizer)
  • Additionally any skill prestige also improves future skill progress: in Easy Skill Options SimpleLevelingRate: +10%, SkillMinEffectiveness: +20%, SkillFatiguePerPoint: -10%, SkillFreshEffectiveness: +10%, SkillFreshPoints: +25%, SkillPointsBeforeFatigue: +15%, SkillFatigueReset: -10%, SkillExpPerLevel: +1%
  • When you prestige skills you have to reset them cuz it wont let you earn exp. You can reset your exp in skill by editing your profile and setting its exp to 0. You go to user/profiles/yourprofile.json and ctrl+f in there for skill you need to prestige (notice how it's in pmc character, there's also scav character, you don't need that). You can see that line at top in probably most IDEs, I use Visual Studio Code.

I'll also consider this app expanding to Skills exp as I already editing save file anyway.

Other skills I haven't hit 50 with yet so no idea for them yet, when I'll reach them I'll be coming up with new suggestions.

I also ditch 64mil (+2 mil per each previous buff) roubles when affordable to increase one bodypart hp by 5 (call it genetic augmentation KEKW)

Not quite yet...