This data pack makes mobs that weren't aggresive enough try their best to kill you.
List of changes:
Axolots act like phantoms, but under water.
Bats poison you when you get too close.
Bees, Cave spiders, Iron golems, Llamas, Polar bears, Spiders, Trader llamas and Wolves are now always angry at the player.
Cats, Chickens and Ocelots carry a baby zombie with an iron helmet on their back.
Cod turn into missles: They'll swim towards you and explode.
Cows and Mooshrooms have poisonous milk.
Dolphins shoot more cod missles when you get too close.
Donkeys, Horses and Mules leave a trail of fire behind.
Drowned now always have tridents. (they weren't trying hard enough before)
Enderman will teleport in front of you every 20 seconds.
Fireballs follow players.
Foxes shoot fireballs.
Glow squid and Squid will blind you using their ink when you get too close.
Goats don't have a cooldown on ramming anymore.
Pandas will be aggressive every time.
Parrots burn and will set you on fire if you get too close.
Pigs turn into hoglins if you get too close.
Rabbits are always killer bunnies.
Salmon shoot lasers.
Sheep have very sharp wool. (thorns)
Snow golems melt.
Striders will sometimes throw you off their back when above lava.
Turtles freeze nearby players.
Villagers and Wandering trades will summon a lightning bolt above the player that trades with them.

Update:
Zombified piglins are always angry
Tropical fish swim around you and pull you downwards.