100% that DHS and AK are in most need of more capacity.
Re-purposing the Dinoland space into something that guests actually gravitate to would be my idea. It needs a big refresh. And yes they need a new land or area that is completely fresh. Also, apparently Pandora has an expansion pad and they need to use that.
In DHS, Galaxy's Edge has an expansion pad as well. That needs to used. The space North of Toy Story Land and West of Hollywood Blvd up to RnRC is a likely expansion area (see screen shot below). Then they just made some land category adjustments on the land East of the DHS parking lots & the Starcruiser. See my screen shot for the areas marked in red:
View attachment 835565
The area in the top left is most likely to be used 1st. No real idea on how the new land designations play out in the future but maybe some parking lot space gets used or something.