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my list is
(csm)2 daemon princes w wings and p armour
troops 5x csm
3x heldrake
ally daemon)
2x Bloodthirsters
2x10 bloodletters
3x daemon princes w flight and armour
what do you think

you can only have 1 bloodthirster and 1 deamon prince allies are a 0-1 choice for HQ and Heavy Support

Don't you mean

4 Bloodthirsters,
40 plaguebearers,
6 daemon princes with wings+MoK?

I have to agree with rihgu. Abuse the double force organization chart. Need 2 hq, 4 troops first & may have 6 fast, heavy, elite while you can get 2 more hq and 8 more troops.

U dont need csm ally. If you main csm then you need 2 squad of 5 marines.

best you can do is 7 FMC out of daemons, using double force or to spam DPs of khorne nets you:
2 bloodthirsters
5 DP of khorne with wings
4 minimum troops, your choice
100-140 pts left over depending on your troops to either upgrade DPs to thirsters or spend on rewards/armor for the easily killed DPs. I would run armor on the princes and then two greater gifts on your warlord bloodthirster.

This is all just khorne, I think Tzeench greater daemon is a little cheaper, but you trad the 3+ armor for psyker levels
Best of luck listbuilding, flyers are good, and certainly can win games, but I think a more balanced list will do better in the post Tau 40k meta.