Hmmm....
Rework of the trophy lodges (customizable plinths [size, placement, environmental textures, etc.], plaques, naturalistic mounts like on trees, etc., etc. etc.)
Rework of the trophy system UI (searchable, different orders, etc.)
New trophy lodge (North American themed similar to the Layton Lake Trophy Cabin but far larger)
Rework of Spring Creek Manor (a new upper floor with huge mounts, weapon displays, etc., and a basement level with a pistol range)
Rework Saseka Safari lodge so that full mounts of elephants can actually fit (for the future)
Total overhaul of the inventory and loadout UI
Harvest screen indicates how rare a fur or plumage type is
Ethiopian reserve with elephants, giraffes, rhinos, leopards, etc. (Ethiopia because it has those animals but is not Vurhonga 2.0)
Amazon reserve with tapirs
China reserve (we'll ignore that it is illegal to hunt there)
High arctic reserve with musk oxen and polar bears as key species
backfill of all maps so there is a minimum of 15 species (including an assortment of birds and small game)
Total rework of SRP so it actually feels like Colorado. Add prairie dogs, coyotes, sage grouse, and others as well
Rework of pronghorn AI so they behave like pronghorn and not like deer (i.e., they run hella fast in the open, not hiding in the trees)
Add all remaining weapons, decoys, and other equipment found in Classic
Rework of all animal models and animations that date from before Emerald Coast
Rework all TruRACs so there is more variety, and more realistic appearances. Start with bighorn and elk
Add atypical racks with drop tines, spikes, etc.
TruPiebald fur patterns
TruSize for crocs and gators
Dog customizations such as collars, harnesses, etc.
New dog "skins" that are essentially new models. For example, in place of the bloodhound, you could Rhodesian ridgeback. And yes, I want a dachshund for tracking rabbits.
Add water buffalo to Emerald Coast
Find some reasonable way for non-grinders to have a realistic chance of finding Great Ones (this may well impact grinding, but since I am dreaming, I am not too bothered by that 😝 )
New character avatars that look realistic, and can be massively customized
New clothing, but all separated, such as shirts, trousers, hats, etc. so players can customize their look.
Camo actually works depending on the environment (as per Classic)
Optional 3rd person views (full figure, quartering, etc.)
Total rework of the ballistics so that it is Tarkov-accurate and the Bullet Bros can stop complaining about it 🫣
Lots of new scope reticles, including military style, all with accurate mildots
That would be a good start.