Give your lord twin lightning claws and MoK and is now ready to lay the smack down in close combat.
Greater daemon is nice but you don't have any other monstrous creatures for target saturation and in time a single G.D will die.
Chosen are mixed up with anti tank and then anti horde weapons. Give them all the same and drop the extra armour.
First CSM unit is ok but you don't need extra armour. Second CSM unit is messed up a lascannon for long range and a power weapon, you want long range get obliterators. Plague marines need a rhino.
Predators don't need daemonic possession or else you're hitting on 4+.
Greater daemon can assault the turn it comes it mate