Household median income is primarily defined by demographic characteristics. Most of those other groups have an average age of around 35-45... For Somalis, it is 20 years old. That low number reduces earning power by an extraordinary amount. When the second generation is in their 30s (the youngest child in the household being at least 25 years), you'll see it increase, by the minimum at least 1/3 of what it is now.
Also, it is important to know, as has been emphasized here, that the community security informal system makes sure people are afloat. Poverty does not affect us as you think. You'd assume we have the least by the numbers alone. The community is relatively resilient, though things are far from perfect.
I have written extensively that the notion that Somalis don't work in America is a lie. Also, there are ways that Somali economic productivity is not fully captured by the formal statistical criterion, adding to the median income argument.
All in all, this reflects the stage of settlement and age profile rather than a cultural work ethic deficit, the latter of which people automatically jump to. I have used formal numbers to show that Somali immigrant males have a fairly high labor force participation when they are new to the land.
It's very important to do research and think beyond certain surface-level metrics; otherwise, people might jump to the wrong conclusions and try to reaffirm the racist stereotypes that serve nothing but to dehumanize us, and it is all based on lies.
There is also the very much stressed thing that I did not mention given it is evident; that other immigrants have other types of incentive migration patterns that made them more opportunistic and ready than Somalis who for the most part did not select based on capitalistic, capital-based logic. I.e., other group had higher self-selection based on education and capital, whilst Somalis are mainly refugee driven or people who lived in post-conflict infrastructural destitute conditions that never internalized the institutional structure of socio-economic priors.
However, these days, the tahrib system somewhat mirrors the same pre-conditions as other immigrants from Africa, meaning, the newer batch of young men traversing will hold higher initial economic productivity as they are a bit more opportunistic, though the share size of acceptance rate quota is extremely reduced because of these factors and racist steriotypes by the pre-existinct Somali communities in the host countries that one can easily debunk.