Uninstalled Norton from my macbook, network isn’t working anymore, macbook crashing into a loop.

I have a macbook pro from 2019

i just uninstalled Norton. A pop up said ‘for Norton to uninstall you need to restart your device’ (sth like that) so I followed that.

My device turned on and made me choose a network for some reason. I clicked my wifi network, typed the password, pressed enter. Another notification pops up. My macbook needs a critical software update (i now still have Big Sur) and I need to be connected to a network to do so. I can only choose between ‘shut down’ and ‘continue’

‘Continue’ sends me back into a loop of typing in the password for my wifi network and getting the notification again (even with a different network)

Through the apple community I find the option to boot my laptop in Safe Mode. Through this I have acces to my mac again and I try to install the software update. Eventually it asks me to type my administrator password to continue the software update. I am certain I have the right password (as it worked in Terminal later), although it doesn’t work.

I was thinking about reinstalling my entire mac OS, although I can’t make a back up bc I don’t have the right ports (or a converter) for an external disk. My iCloud and Apple ID don’t seem to work either.

I installed Norton’s ‘remove Norton mac files’ zip. I ran the whole application through Terminal and restarted my mac but it didn’t make any difference.

Can someone please help me out with this? I have an assessment next week for which I need my mac rn to work on my project. I can’t do anything right now.