Two problems with German colonies in Africa:
- After Belgian capitulation Germany can seize Congo, but leaves Uganda as Belgian colony. Germany should seize it as well to avoid yellow enclave in the middle of Africa.
- If Deutsches Kolonialreich is annexed by Entente, its provinces don't come back to Germany after Ententes capitulation (my case was UK annexing Kolonialreich and still keeping its provinces after peace treaty).
If I'm not mistaken there are still no capitulation events for Portugal and USA. In case of Portugal Germany could annex their colonies in Africa and Asia, in harsh version maybe even islands on Atlantic Ocean? Not sure about total victory over USA (which is easily achievable, as USA has very few units).
+ OTT could annex Egypt and Yemen as well after British capitulaion, it has claims on these territories.