Steps to redirect all the sites hosted under my cPanel to new my website www.example.com

Step 1: Login to your cPanel account.
Step 2: Go to Document Roor folder [/home/usernmae/public_html]
Step 3: Click File option to create a new file.
Step 4: In the New File name field, enter the filename as a .htaccess.
Step 5: Copy and paste the below code to .htaccess.
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 Redirect 301 / https://www.example.com/
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Step 6: Finally, click Save changes option.