To make your registration Page your main page, you need to follow some simple settings on your WordPress DashBoard.
Go to WordPress Dashboard >> Select Setting option >> Click on the General settings and check the box “Anyone can register” and provide the role to the new user.
After saving the above settings just go to the Reading option of the Settings
Make sure your bullet is on the “static page” and now select the Register page as your Home Page from the DropDown. Just save the settings.
Open your site after logging out and reload the page.
You can now see the Register Page as your front page.