It is up to the OP's airline to locate the luggage via their baggage handling agent. I'm not sure how things operate in Somalia, so please forgive my ignorance, but I would have expected there to be an airline or handling agent desk in the baggage reclaim hall where you would report the missing bag and obtain some form of reference to confirm you have report its loss. They should make all efforts to locate and ship your bag to you.

Failing that then you need to claim directly with the airline asap.

I thought StaySure might be a good firm for travel insurance for future trips as they used to offer insurance for countries on the FCDO no travel list. Sadly, they won't for Somalia. Annoyingly, this isn't an issue with the destination, it's an issue with the originating airport.