Hi @olivela,
Response 1#:
a) You will find the option to archive in Account Settings>Organization>Click on 3 dots on the top right side:-
And the steps to access archive content are here: Where does Archive lead to
b) You can find your Org ID in your Organization setting, Cmd / Ctrl + P → Copy API Key.
To delete an organization, please share the same with us.
Response2#: We’re taking a look at your second question as well!