Well the land is sort of being expanded with King Kong. But that then uses up most of the expansion space availabe, IoA is locked by roads on those two sides. However there are small spots such as where Triceratop encounter was. Also the discovery centre could be worked on and improved.
Put a dark ride in Discovery Center (Make the queue an interactive exhibit/demonstration) - C ticket
Put an Amber Mine family coaster in the Trikes plot (possibly a little over the water?) - D ticket
CJ, PF and JPRA get extensive upgrades
Observatory tower utilizing CircleVision-esque tech (C-ticket) added to Camp Jurassic
AA dinos and mini-shows scattered throughout the land
JP M&Gs with Malcolm, Hammond, etc... again
Gyrospheres around IOA lagoon (trackless transport, some "tunnels"/"caves" scattered along the way to hide Popeye, Seuss, etc) - C ticket
Other than removing JPRA for two E-tickets: Helicoptours and an more concise (6-7 min instead of 11-12 min), indoor, upgraded version of JPRA: I don't know how one could make JP/JW much better than that.