Any Tzeentch's Campaign Tips?

I just started a campaign with him, and the first few turns went "smoothly", but when I managed to defeat the Slaanesh's faction on the right of the Southern Chaos Wastes... tons, tons and tons of boring turns until I manage to return to my capital, and then fight Oxyotl. Should I simply disband everything, losing units with high EXP and risk a declaration of war from Teclis (due to faction strenght too low), or there's another way? Or another place to go from there. In all those turns, not a single cult spawned (I honestly don't know how they spawn, if it's just random or I have to do something) to teleport, or anything... Any suggestion is welcome!

Thank you in advance for all your tips. :)