I’m sorry you’re having trouble with the plugin on your site. The data is recoverable if you or your host has taken recent backups of the site.
Please note: Event Espresso does not delete data. Can you check with your website host to see if they’ve moved or migrated any of the database tables used by your website?
With regards to the license key expiration, your account currently has the EE4 core plugin only. Any activated add-ons will show an expired license error, so those can be temporarily deactivated then you’ll be able to update the EE4 core plugin.