Get a bigger drive. Swapping them out on modern laptops is often quite easy. Grab a copy of the manual or search for videos if you want to know more. Replacement 1tb nvme drives can be quite cheap these days, 2tb ones aren’t especially price prohibitive either.

I’ve tried and failed with authelia a few times. Be interested in seeing how others have it configured, if you could link the tutorial you used too that’d be awesome. Maybe I’ll have luck this time