npkill is an npm package that you can run with npx npkill -f to search your computer for every single node_modules folder that hides somewhere on your disk.
Most of these folders most likely aren't used any more and can be safely deleted. npkill will list all theses folders and you can decide to delete them.
This can free up to several gigabytes on disk space. I personally deleted 20GB of unused node_modules with my first npkill use.
