DaemonUmbra

Your insistence that your copy of Minecraft is legal has me concerned. Please provide a screenshot of the launcher showing you logged in. As well as the exact way you are running the installer.

Please provide your full debug.log using one of the paste sites listed in my signature below

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Please provide your full debug.log using one of the paste sites listed in my signature below.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

I'm just not seeing this issue. Do you have any mods in addition to Forge? https://imgur.com/hUBMwmX

More ram means the processor has to work harder to run Garbage Collection. This is not the cause of your issue but I must recommend cutting that back as far as you can. This log looks to me like a mod has a bugged advancement, sadly I can't tell which.

User was banned for piracy. Buy the game!

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Is this on a server or a single player world?

I can't recommend any host that advertises free hosting. It tends to mean they are all cramming everyone onto the same hardware and everyone has to share the machine's resources.

There's no crash here, just the server kicking people when they try to join before it's done starting up. You also appear to be using Aternos, which I can't say is a reliable or quality server host.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Really old Minecraft versions are no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

You can't just move .minecraft without command line arguments to the launcher. I would recommend pinning it to Quick Access in File Explorer instead

Twitch's client is known to quietly screw up installing Forge

When I say "It depends on the mod" I don't mean I'm going to check for you. I would recommend using a test world if you must.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

DarkUtilities requires BookShelf, which is apparently not indicated in the mods.toml so Forge can't show a proper error screen

Please provide the full debug.log using one of the paste sites listed in my signature.

That would depend on the mod

Can you explain to me why you're allocating 29Gigs of RAM?

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

I would recommend repairing the instance by opening its page, clicking the gear, and clicking repair. If that doesn't work, my signature has a video on how to run a Twitch modpack manually.