adiobug Hi hi, I'm a level 100 Air Sacrier and I was feeling your pain not too long ago- so let me start you off with a bit of know how before I go into advice, etc. I decided to move this into a new thread because I believe it is much more relevant for me to scoot it over where discussion about specifically this can be had.
Air Sacriers are very capable of dealing large amounts of damage but their primary utility and claim to fame comes from their ability to utilize Sacrifice AND be able to get allies BACK into positions for better dps. That being said, you should still be capable of setting up/doing 200-300 damage a turn per creep hit by MS