well,my army list.How can i improve it for a tournament?

+Kinkimarkis el Engañoso (Daemon prince of Tzeentch) @ 200 Pts
Mark of Tzeentch; wings; warptime; Bolt of change

+Karmarhis Lanzanegra (Chaos lord) @ 170 Pts
Melta Bombs ; Chaos bike Daemon weapon;Personal Icon

++9 chaos marines(+ champion with power weapon and melta bombs),2 flamers,rhino( extra armour) and chaos glory @ 255 Pts
2 squads: @ 510 Pts

++8 summoned daemons @ 104
2 squads: @ 208

+4 chaos bikers(+ champion with power fist),2 meltaguns and chaos glory @ 235 Pts

+7 chosen chaos space marines(+ champion with power fist),2 meltaguns,2 flamers,rhino( extra armour) and chaos glory @ 269 Pts

+6 chaos havocs,4 missile launcher and chaos glory @ 180 Pts

+3 obliterators @ 225 Pts

total: 1997