Which other least expensive couriers to use now that Qexpress is under liquidation?

Hi 👋🏻 now that Qexpress is under bankruptcy, may I know which other courier you guys will use beside them ? I sell on EBay and my last 3 packages to US stops at tracking with ‘your parcel arrived at destination country’ and I lost quite a bit when the buyer gotten a full refund from EBay and I am still not getting reply from SingPost !