Custom Datapack Not Registering in Game

My Datapack goals: Alters 5 mods. 4 of which are for mob loot tables (LT), and one which alters recipes (R).
LT:
Birds Nest - Overwrites existing pool to add an item from my own mod.
Butchery - Overwrites an existing corpse's pool to include item referenced above.
Exotic Birds - Overwrites existing pools to add an item from my own mod.
Naturalist - Overwrites existing pools to add an item from my own mod.
R:
Legendary Survival Overhaul - Adds two recipes for the mod's sewing table as alternatives to existing ones, which now uses my custom mod items
Extra Details:
My custom modded items have different uses and are currently in their own separate mods
Future Plans:
Similar loot table overwrites for Alex's Mobs, and to add loot tables entirely to the crows and penguins of Messenger Crow and World of Penguins respectively.
Potential for Release:
Pending Approvals; My datapack will either release on its own, or be combined with the existing mods I have, to create a "one does all" effect.