Hey there, nice looking little P Afra starter. Most peoples mistake with these trees are not being aggressive enough when pruning. You can literally cut it down to tiny stubs leaving no leaves and if it has the right conditions it'll bounce back like nothing happened. The issue you have is the plant is too tall for the trunk width. You've got 2 relatively long trunks that are straight and about the same size as the trunk. At a minimum I'd cut at all of the red lines here, basically cut back to one set of leaves:
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If you are OK getting a little bit more aggressive, personally I'd cut it back to the red lines something like below:
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As you can see with the mocked up canopy, it gives it a more realistic tree feel, something that looks like a big full grown tree with a nice canopy shrunken down. If you were to do that, you'd be left with at least 2 very good sized cuttings that you could propagate to make additional plants to mess around with.
As far as planting a forest with these, you can pretty much do whatever with them. I've taken multiple cuttings and just popped them in a little bonsai training pot to make a forest before they had any roots. You could let them grow for a few months then assemble your forest. Really, as long as you let the cuttings dry for a few days to callous over, then plant them in a well draining mix they will usually survive. I usually hold off watering for the first couple weeks after planting then as they start to root you can water them more regularly.
Here is a great video from Eric Schrader showing how he handles these plants. At about 4:30 in the video he works on one that is about the same size as yours and you can see how aggressively he trims it back:
