Hello,

Make sure you have created My Account page, it has this shortcode [woocommerce_my_account] and this page is chosen and set in the Woocommerce > Settings > Advanced http://prntscr.com/o5lig2

If you have set everything correctly, but the page does not work, deactivate all the plugins not related to the theme and switch the parent theme, check the issue, if the problem remains, leave the plugins not activated for us to check.

Best Regards