Hi Stef,
Thank you very much for having a look at my site. Yes, I managed to reconnect Jetpack, but, as you noted, wp-admin and wp-login are not working. In fact, when I access the dashboard, nothing works except for ‘My Jetpack’. This means that I cannot go to ‘Plugins’ and deactivate the installed ones.
As you suggest, I will contact my hosting provider to see if they can help…
Thank you, once again, and regards,
Guillermo