Carts getting deleted

I’m new to woocommerce, I’m having a problem my customers day to day add products to the cart, they finish the order in 5-6 days, but sometimes after 2 days the users are forced loged out from WP and the carts are cleaned.
Or simply when they log out the cart is empty. I don’t want this behavior. Is there some way to save the cart in the DB? or there is other way to fix this behavior?

Tried to extend session but not worked

add_filter(‘wc_session_expiring’ , ‘my_wc_session_expiring’);
add_filter(‘wc_session_expiration’ , ‘my_wc_session_expiration’);

function my_wc_session_expiring($seconds) {
return (60 * 60 * 24 * 8) – (60 * 60);
}
function my_wc_session_expiration($seconds) {
return 60 * 60 * 24 * 8;
}

The page I need help with: [log in to see the link]