Hi there and welcome
Can you do the following please
Then tell me if it now starts correctly.
When you did the first aid, did you do a repair disk?
Did it complete?
Power it off.
Then power it on with SHIFT held down and and press and hold the Shift key while it boots. You can stop holding the Shift key when you see an Apple logo and progress bar
Then tell me if you can sign in please.
The hard disk has crashed, this is the issue. You see that is has 0K available, it is not even mounting.
Was there anything else?