Hello,
If “my account” and “checkout page” is missing from your site. Then you can simply create two new pages from Dashboard >> Pages >> Add New.
Use this shortcode in my account page “[woocommerce_my_account]” and insert the “checkout” element with Wp-Bakery Page Builder in Checkout page.
Screenshot for clarification: https://jmp.sh/0Zlff3Z
After creating both the pages go to WooCommerce >> Settings >> Advanced and select the “Checkout page” and “My Account page” from the drop down list and save the changes.
Best Regards.