Somalia has been the home of several successful sultanates, empires, and city-states throughout history, almost all of which focused immensely on trade, both within the Horn of Africa and around the world. Somali trade routes went as far as Venice, Malacca, and Beijing. However, despite traveling the world, the Somali language has had little impact on other languages - a quick search has turned up no results of pre-modern Somali loanwords into other languages.
The challenge is to create a timeline where Somali becomes a valued trade language, learned outside of the Horn of Africa - a unified and trade-focused empire, colonization outside of Somalia, or anything else that could encourage the use of Somali.