i meant keeping them dutch
Keeping South Africa Dutch shouldn't be that hard. Avoid the French revolution or at least the initial militairy succes of the French revolution and avoid the Netherlands being defeated by it and South Africa remains Dutch. Actually the Batavian republic regained South Africa from the British for a while, so a POD there might work too. Avoid Louis Napoleon from becoming king of Holland for example. So a Dutch Cape Colony is rather easy.
Dutch New Netherlands/Amsterdam. Slightly harder but not impossible. After the second Anglo-Dutch war in which the English captured it, they offered to return it to the Netherland after the war, but the Dutch preferered Surinam, which was more profitable. A bigger Dutch victory during the Anglo-Dutch war might do the trick too. The biggest problem here is you need a different policy towards setler colonies. The Dutch basicly colonised for money and the fur trade of North America was less profitable than the sugar trade of the Carribean.
Dutch Brasil also failed because of bad policy. You need some more competent people there to rule it than OTL. Also it probably wouldn't be all of Brasil, merely the parts near Recife and it ouldn't become a settler colony, but more like a Surinam.
Dutch Australia and New Zealand, well the problem there is that there is nothing to gain there, it is out of the way. There really exists no good reason for the Dutch to settle it. Maybe if gold is found in Australia by Dutch explorers. Or west Australia could be used as a halfway station for the voyage towards the Dutch East Indies. I believe the curents the VOC used come close to Western Australia, so that could be a possibility.
The biggest problems with creating Dutch settler colonies is motivation. Dutch colonisation was mainly motivated by making as much money as possible and they were very good at that. For settling colonies you need to switch at least partly towards a different policy.
Another big problem is overextention. The Netherlands is a relatavely small country, it can only colonise so much. Creating a Dutch USA is simply impossible. The Netherlands is too small for that. If the Netherlands included (more of) Flanders and Brabant that could work, just like a more expensionist Netherlands towards Germany. The Netherlands probably could expand slightly into Germany and incorparate areas like East Frisia and Cleve, which were already de facto ruled by the Netherlands. Still you have a small country, certainly smaller than England or France. The Netherlands could use Hugenots, "Belgian" protestants and Germans to populate their countries. I think they would assimilate into the Dutch population.
Basicly I think it is possible for a Dutch colonial empire to consists out of the New Netherlands (New York, New Jersey and Delaware), Dutch west indies (Dutch Antilles and a couple other Carribean islands like Tobago or the Virgin islands), Dutch Guyana (Surinam and British Guyana), New Holland (Brasil around Recife), Dutch Gold coast (Ghana), the Dutch Cape Colony, Dutch East Indies (Indonesia and Malaysia), Ceylon and New Holland II (Western Australia). More than that and the Netherlands gets overextended and even this will be hard to keep.