Can you access File Manager? 000webhost cPanel > Manage files
Please make sure you are using the credentials from 000webhost cPanel > Settings > General > FTP details, with
Plain FTP as encryption.
Please change your website password and try again: 000webhost cPanel > Settings > General > Change password
If this does not solve the problem, please turn off all your firewalls. Make sure FileZilla is allowed to access