@Blue mame
Here are some suggestions that can get you closer to what you expressed in this game.
If you look at my posts, you will see I am a big advocate for visuals, aesthetic
and interactive environment.
There is something that you can try, but it will require personal effort.
Using one of the three terrain generators, design a 3d landscape, make it
a 10k world, you can go larger but as a start 10k should suffice. Concentrate on
breaking up line of sight and straight lines. But allow vista views and panoramic
scenery.
Meaning don't build straight lines to poi clusters, build in uneven, blocking,
and broken, terrain in between poi clusters, to take advantage of the stamina
monitor, when going up varying grade slopes. Arrange your poi-list in a hierarchy,
and commonality, to make areas themed.
Don't rush to get the fastest vehicle, instead progress through the ages. Increase
spawn, and shorten respawn timing across the board, these are blockers. In each
progressive biome have more of the ranged, and flying and quadrupeds to spawn, and
incorporate more of the minibosses in the open, both day and more intensely at night.
These are the blockers +. Reduce the volume spawn of the key items to unlock each biome.
Change a few of the entities properties, an split them into a hierarchy of predatory groups
and you will hear, roaming, fighting, mob battles, and eating, constantly. Extend the
territorial range and length of chase time for entities, no need to speed them up the
natural raised amount of entity spawn will take care of that.
In the wilderness spawn pois of opportunity, and also for temporary respite, recovery,
and path planning.
It will not be a 100 kilometer trek, but 9k to get to the starting point with basic gear,
will change how the game plays out. Extend the distance to quests, meaning going through
more dangerous territory. Allow animal packs to spawn in multiples of 3 or more. and allow
vultures to insta attack.
Human seek out patterns to recognize, IE. they notice repetition, and they see straight
lines and hard edges. Break this up, hinder movement, occupy more of the free time with
combat, combat avoidance, and healing and a 10k map can begin to feel like a hundred.
The reason for the elevations and visual blockers, adds to discovery, and unknown on what
is on the other side of that precipice, will there be a road, is there one kilometer of water to
cross, is there a city or just more open terrain full of crap that wants to eat you.
For the sky possibly use one of the modded skybox mods, pick and set your spectrum lighting
to a single one across the biomes. Blend the edges of the biomes with approx 100 to 140 meter
overlaps, i say 140 because of lod distance using flagpoles as an example.
It will break up noticing the change between biomes and make it feel more contiguous.
It can be done, it just takes personal effort to get it done.