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I have a massive amount of chaos spawn with khorne daemons im wondering what else could I buy in terms of supporting them

What kind of support are you looking for?

If you are looking for support in terms of buffs I'd suggest Warshrines to give them a re-rollable To-Hit buff, and Khorne jugger lord for his Blood Stampede +1 Wound ability.

You could recycle units too. Get a Chaos Lord with Unending Legion Command Ability. Multiple Sorcerer Lords of Tzeentch; Bolt of Change can create more spawn, same as Mutaliths.
Morghur Master of Skulls also has a hero ability that potentially kills friendly units and turns them into spawn.

You could also support them with a Gigantic Chaos Spawn from Tamurkhan's Horde.