I'd firstly engage very well qualified and experienced people to work on a long term strategy for the park. I don't know what exactly that would be, but as the owner I would specify the things below, and consult on the rest which would need my approval.
That might take a year. Then I'd close the park for 18 - 24 months for major redevelopment.
Upon reopening, it would have a new name, and a new coherent theme.
The animals might still be there, as might the waterpark, depending on the outcome of the long term strategy.
As much as I loved the idea of SkyVoyager, I believe it's now very much tainted with negative perception of its safety. I might rebuild it in a new location and new building, again only if it fits the new theme and plan for the park.
The new park would NOT have any of the land sold off (if it's not already too late), and would make full use of all the land (but that doesn't mean it would be overcrowded, or that there wouldn't be any open space within the park.
As much as I like the Disneyland copy entrance, it would all be removed and replaced to make it obvious from guests arrival that it's not Dreamworld anymore, but a completely new park!
There would be a themed hotel giving guests the ability to have a holiday at the park, a bit like the one at Sea World, but themed as I said, and more luxurious.
There would be a range of very good quality, unique, but affordable family restaurants in suitable locations throughout the park.
There would be very high quality, unique entertainment both in "street theatre" style, and in one or more purpose built venues, and this entertainment would be refreshed frequently.
The park would include a wide range of rides, all very well themed and immersive, and none similar to rides already at other Gold Coast parks.
Pricing would be competitive with Village, but would start considerably cheaper to help get people to come back and give the new park a try.