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Nice, that is progress

Can you open a terminal inside this kiosk mode you mentioned?

If so, before trying anything else, plug a usb drive and back up everything you think you might need later

After that, you can do the following:

sudo systemctl stop lightdm (or gdm if it can't find the lightdm service)

this will stop the current X session and drop you back to a TTY

login on this terminal

rename files like .Xprofile and .xsession or something like that to something else (I like to append .old)

try to start a new session with:

startx (try to append --verbose to see if it throws any useful log

if startx didn't work, try sudo systemctl start lightdm

Let's see what happens after all that

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