Yucelyener htaccesse aşağıdaki kodu ekle.
# http://www --> https://www
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# http:// --> https://
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule .* https://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# https:// --> https://www
RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule .* https://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
Edit: sadece kodu eklemen yeterli başka bişey yapmana gerek yok