SQL запрос сделать в базу. Только заменить на свои
UPDATE wp_options SET option_value = REPLACE (option_value, 'http://old_domain.ru', 'https://new_domain.ru') WHERE option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET post_content = REPLACE (post_content, 'http://old_domain.ru', 'https://new_domain.ru');
UPDATE wp_posts SET guid = REPLACE (guid, 'http://old_domain.ru', 'https://new_domain.ru');
UPDATE wp_postmeta SET meta_value = REPLACE (meta_value, 'http://old_domain.ru','https://new_domain.ru');