Hordes spawn for a couple of nights then out of now where they stopped spawning. This is my mod list

[Amethyst Equipment
[Nullscape
[Tree Harvester
[Aethersteel
[YUNG's Better Dungeons (Forge)
[We Got Runners!
[Radiant Gear
[Structure Gel API
[The Hordes
[Double Doors
[Torchmaster
[Better Advancements
[Fastload
[SuperMartijn642's Config Lib
[Mutant Monsters [Forge & Fabric]
[Embeddium
[Useful Railroads
[Skin Layers 3D
[Zombie Horse Spawn
[YUNG's Extras (Forge)
[SuperMartijn642's Core Lib
[YUNG's Better Strongholds
[InsaneLib
[Sophisticated Core
[StackablePotions [Forge]
[Combat Roll [Fabric & Forge]
[Better Third Person
[Placebo
[Iceberg [Forge]
[Nether Skeletons
[Universal Enchants
[The Aether
[Hunter'sReturn
[Gilded Netherite CJ Edition
[Shiny Horses Forge
[Towns and Towers
[YUNG's Bridges (Forge)
[Dusk[Forge/Fabric]
[Dungeons Artifacts
[Ad Astra
[Balm (Forge Edition)
[Bookshelf
[Charm of Undying
[Illager Invasion [Forge & Fabric]
[Craftable Enchanted Golden Apple - The Craftables Series
[Gateways to Eternity
[Lootr (Forge)
[TrashSlot
[Revamped Cats
[New Shield Variants
[Chipped
[Infinite Trading
[Serene Seasons
[FastSuite
[Inventory HUD+
[Corpse
[Caelus API (Forge/NeoForge)
[YUNG's Better Witch Huts (Forge)
[Easy Mob Farm
[Bygone Nether
[Sophisticated Backpacks
[Guard Villagers
[Connected Glass
[Awesome Dungeon Ocean edition
[U Team Core
[BetterF3
[SerializationIsBad
[Visual Workbench [Forge & Fabric]
[YUNG's API (Forge)
[Plasmo Voice
[Carry On
[Crafting Tweaks
[Dungeon Crawl
[JourneyMap
[GeckoLib
[More Crossbows CJ
[Moonlight Lib
[Tiny Skeletons [Forge & Fabric]
[Oculus
[Waystones
[Goblin Traders
[Dungeons Weaponry
[Traveler's Backpack
[Item Highlighter [Forge]
[Healing Campfire
[CreativeCore
[Stabx Modern Guns
[Better Than Mending
[Edible Zombie Flesh
[DarkSmelting - Smelt Armor, Tools & Weapons (Fabric/Forge)
[PlayerRevive
[Camera Mod
[Collective
[Save Your Pets
[AttributeFix
[Elytra Slot
[Xaero's World Map
[Framework
[Day Zombies Rebooted
[Farmer's Delight
[Majrusz Library
[Apothic Attributes (AttributesLib)
[Botarium
[Iron Bows (FORGE)
[YUNG's Better Jungle Temples (Forge)
[Pick Up Notifier [Forge & Fabric]
[Vanilla Plus Tools
[AI Improvements
[Ad Astra: Giselle Addon
[Server Performance - Smooth Chunk Save[Forge/Fabric]
[YUNG's Better Mineshafts (Forge)
[JourneyMap Integration
[Fusion (Connected Textures)
[YUNG's Better End Island (Forge)
[Cristel Lib
[Tiny Coal
[TerraBlender (Forge)
[Athena
[DarkGlint - Enchantment Glint (Fabric/Forge)
[Reroll Enchants
[Biomes O' Plenty
[Atlas Lib
[ESSENTIAL Mod
[Client Crafting
[Disenchantment Edit Table
[Xaero's Minimap
[Resourceful Lib
[Xaero's Minimap & World Map - Waystones Compatibility [Forge]
[Compact Experience Bottles
[Blue Skies
[MrCrayfish's Gun Mod [Unofficial]
[Paintings ++
[Forge Config Screens [Forge & Fabric]
[Brutal Bosses - Custom Bosses[Forge/Fabric]
[Enchanted Charms
[ModernFix
[When Dungeons Arise - Forge!
[Majrusz's Enchantments
[Additional Structures
[Wireless Chargers
[playerAnimator
[Portable Tanks
[YUNG's Better Ocean Monuments (Forge)
[Repurposed Structures (Neoforge/Forge)
[Ultris: Boss Expansion
[Configurable Extra Mob Drops
[Cloth Config API (Fabric/Forge/NeoForge)
[Deeper and Darker
[Music Player
[GraveStone Mod
[Sophisticated Storage
[RevampedWolf
[Overflowing Bars [Forge & Fabric]
[Nyf's Quivers
[The Graveyard (FORGE)
[Mouse Tweaks
[Better Fps - Render Distance[Forge]
[Tool Belt
[Tools and armor of Obsidian
[Better Compatibility Checker
[TexTrue's Embeddium Options
[Attack Speed Enchantment
[Farsight [Forge]
[Death Backup
[Loot Integrations[Forge/Fabric]
[Puzzles Lib [Forge & Fabric]
[Easy Anvils [Forge & Fabric]
[Mindful Darkness
[Craftable Horse Armour & Saddle
[Solar Cooker
[FastFurnace
[Resource Pack Overrides [Forge & Fabric]
[Cupboard
[Clumps
[Paper Doll [Forge & Fabric]
[AppleSkin
[Library Ferret - Forge
[ImmediatelyFast
[Curios API (Forge/NeoForge)
[YUNG's Better Nether Fortresses (Forge)
[Dungeons Enchantments
[Just Enough Items (JEI)
[Piglin Proliferation
[Supplementaries
[Bottle Your Xp
[Jade 🔍
[Searchlight (& Wall Lights) (Forge)
[Enchantment Descriptions
[Bartering Station [Forge & Fabric]
[Searchables
[Citadel
[Resourceful Config
[Bagus Lib

Which version are you using?

And do you have any logs?