trinkets VS RepurposedStructures

Trinkets Mod Quick Start Guide

Trinkets (Fabric) (by EmilyPloszaj)

Something like Curios/Trinkets/Baubles with a back slot for the backpack and a mod like Artifacts to give purpose to the rest of the extra slots,

Trinkets 3.0.0 provides modpack makers a ton of options to change what slots exist, how slots work, what items go where, etc. In addition, it also allows items to provide entity attribute modifiers to change how many slots of a certain type exist. This can end up adding slots that a player has 0 of, or removing slots so that a player has none. Trinkets has a ton more features and comprehensive documentation can be found here.

Looks like either Additional Structures or Repurposed Structures

For now, I use Nullscape for generation, Repurposed Structures to add more structures, and Basic End Ores to make mining in The End worthwhile.

Repurposed Structures (Forge) (by telepathicgrunt)

I'm pretty sure they spawn in unloaded chunks. Also, if you want more structures I'd suggest using Repurposed Structures, Bygone Nether, and The Graveyard. Also, to make it easier to find these structures you can use Explorer's Compass. If you want to add more mobs I'd suggest Dragon Mounts and Lava Monsters. Also, if you don't want to lose your items when you die you should use either GraveStone or Corpse.

Forge: https://www.curseforge.com/minecraft/mc-mods/repurposed-structures

I don't have mods for everything you have asked for, but you can check some of the ones I know (1.18.2 since Terralith isn't 1.19 yet, I am unsure if it will be but I think it will) Terralith is a mod that adds very unqiue biomes without adding any new blocks to the game, there are some very interesting forests, deserts and even volcanoes Repurposed-Structures is a mod that adds new dungeons and other structures which as far as I know adds 0 blocks as well Better Village is a mod that makes villagers a lot more interesting in my opinion, I have never used it but it looks amazing from the images. Ambient Sounds adds a variety of sounds to the game and it make it feel a lot more alive Alternatively, you can use Dynamic Surroundings if you are playing 1.16.5, I like that mod a lot more

And finally, something like Repurposed Structures that adds more variants of vanilla structures to the game.