The open_basedir restriction in effect

ERROR: The directory [/storage/app] must be writable by the web server.

ERROR: The directory [/storage/framework] must be writable by the web server.

ERROR: The directory [/storage/logs] must be writable by the web server.

ERROR: The directory [/bootstrap/cache] must be writable by the web server.

although you are sure the directories are already writable.

Then it is very likely that the open_basedir setting is currently enabled on your server, which prevents the application from loading. If you are using Plesk, you can go to the domain setting page to turn it off. See the screenshot below, make sure open_basedir is set to none.

Screenshot from Plesk Panel