User-agent: *
Disallow: /wp-content/uploads

User-agent: Googlebot-Image
Disallow: /

User-agent: *
Allow: /wp-content/uploads/2020

User-agent: Googlebot-Image
Allow: /wp-content/uploads/2020

User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php