Change ‘landingpage’ in My Account

**
 * Change landingpage on My account page
 */
function twstudio_subscriptions_as_myaccount_home(){
	if ( is_account_page() && empty( WC()->query->get_current_endpoint() ) ){
		wp_safe_redirect( wc_get_account_endpoint_url( 'subscriptions' ) );
		exit;
	}
}
add_action( 'template_redirect', 'twstudio_subscriptions_as_myaccount_home' );

Goes into functions.php. Change ‘subscriptions’ to your endpoint of choise.