MC1.20.1, Forge 47.1.3, the game crashed shortly after being launched and here's what the launcher reported (I failed to find where this log really were on my computer)

Closing this until we get a mod list and a full log.

console.log
debug.log
latest.log

Unfortunately with this many mods installed, this falls into the realm of modpack dev and not something we can diagnose on Github. Feel free to use our discord and ask for help from experienced devs.

[Serene Seasons Transformer]: Successfully patched shouldSnow

This is likely an incompatibility between TFC and serene seasons, and there's very little we can do here because the mods are fundamentally incompatible.