Unset Shipping Methods based on weight in woocommerce

I am using the following function to enable weight based shipping in woocommerce. For example- when the total weight in the cart is less than, 15.84, the flat_rate:5 shipping method should be activated and the other methods are getting unset. However, I have to write all the methods getting unset individually. How to change the unset command to unset all shipping methods which are not flat_rate:5,6,8 and so on? add_filter( 'woocommerce_package_rates', 'bbloomer_woocommerce_tiered_shipping', 10, 2 ); function bbloomer_woocommerce_tiered_shipping( $rates, $package ) { if ( WC()->cart->cart_contents_weight < 1 ) { if ( isset( $rates['flat_rate:5'] ) ) unset( $rates['flat_rate:6'], $rates['flat_rate:8'] ); } elseif ( WC()->cart->cart_contents_weight < 5 ) { if ( isset( $rates['flat_rate:6'] ) ) unset( $rates['flat_rate:5'], $rates['flat_rate:8'] ); } else { if ( isset( $rates['flat_rate:8'] ) ) unset( $rates['flat_rate:5'], $rates['flat_rate:6'] ); } return $rates; }