An alternate cape of good hope

Perhaps this question shows a total ignorance of maritime technology or logic, but how would one get either a proto-Swahili, Persian, Indian or Arabian trade/exploration mission to round the cape of good hope going the other way, and also continue to do so? I know its not as if these powers didn't trade significantly in the Indian ocean anyways as far back as ancient antiquity - what kept them from using their oceangoing ships to explore further and either circumnavigate or at least explore Africa?

I know Africa was wealthy and filled with trade goods that would be worth exploiting even in early antiquity. Would a scenario like the one posed in the Nok Steel timeline be the best bet? What alternatives might work - I was thinking it might be as simple as having traditional Vedic religion not have a prohibition against crossing the black water, although I've heard such a prohibition was never really all that important anyways. And sides that never should have stopped the Persians or Arabs.
 
I remember from when I was reading about the Portuguese exploration of that part of Africa that the Mozambique Channel is apparently incredibly rough going. It's been a while but I remember reading about Portuguese ships being destroyed by being pulled onto hidden shoals and rocks as well as simply being broken apart by the sheer force of the water due to the Agulhas Current. That might be part of why those entities never engaged in significant trade around the southern tip of Africa.
 
What can they get from West Africa, that they can't get from East Africa?

The Arabs, certainly, had major trade with Eastern Africa, which resulted in Swahili.

Why would they WANT to go further?

The Phoenicians and the Egyptians are both rumoured to have circumnavigated Africa (as an exploration/ moonshot kind of thing).

It's very, very expensive to do long distance travel in early ships, what's in it for them?


We've had TLs and suggestions that e.g. Phoenicians might have been able to set up a colony at the Cape (where their Mediterranean agriculture would work). But rounding Africa? On a regular basis? I can't see it.
 
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