If your luggage is lost after your flight, you should immediately contact the lost and found department of the airport you are departing from. They will help you locate your luggage and provide assistance in retrieving it.
Depending on the airline, you may be able to file a claim for any lost or damaged luggage. If the luggage is not located, the airline may provide a certain amount of compensation for the loss, depending on the airline's policy. You should also make sure to document any lost items and report them to the airline, which can help you in the event of a claim.
Additionally, many credit cards offer comprehensive travel insurance that provides coverage for lost luggage, and it may be worth it to look into this option.