Hi, I guess you are trying to set-up your site in two languages without the help of any WordPress multilanguage plugin, unfortunately, what you are asking is not possible without using multilanguage plugins. You may check out the article below to learn more about having your WordPress site in two languages;
https://www.wpbeginner.com/beginners-guide/how-to-easily-create-a-multilingual-wordpress-site/
Have a nice day!