the Giants game engine is horrible with VRAM usage. i have an rtx 3070 with 8 GIG of ram and it can consume all 8 gig if i'm not careful.
some things you can try...
- use DLSS
- disable STEAM overlay
- close your web browser or other apps that use VRAM while you play
- you can try to set your resolution lower, however... this can have diminishing returns as it can put more stress on your CPU. you will have to check. using this launcher and helping spread the load across your cores might offset it and clear up some VRAM space
- large mods/map can kill the VRAM. choose your mods wisely on what you want active. and only keep active mods in your mods folder. the game loads ALL MODS in the folder whether you are using them or not.