DRC for the moment seems very disconnected. Barely a country. So therr may be specific regions and cities to invest in now.
Far East bordering Rwanda, Burundi, Uganda are where you find the local ship building springing up, where commerce is big despite the 2 decades wars, the iimport export business there makes EAC make lots of money
South East area or Moise' Katanga province Tanzania and rest of SADC have been attracted by economic activities there., biggest beneficiaries are Tanzania, Zambia, Zimbabwe and South Africa and even Namibia.
Far West (Kinshasa and KC provinces), trades more with Angola, C-Brazza, Namibia, SA, Imports from Europe.
The mighty Congo River connects half of the country though....So, Congolese Ship, Barge builders have a bright future. Its a matter of getting a common sense leadership and economic growth will be in double digits with a braodbased economy.
I have realized one thing. The whole country does not need to be doing the thing....but rather each region or Province need to capitalize on it speciallities and everything will naturally spread allover the country.