>>/3159/
Astra is a tool for you to use on your own (with the aid of central Astra who maintains the database), she can't do general requests. Her base functionality is just an astral search engine, but if you work with your local Astra you can link her to all kinds of abilities that you yourself have, so that she functions as an interface for these abilities.

> reversing a spell
If the spell is material, or imprinted on your karma, I suggest making use of the newly hired sunflower temple maid.
see
 >>/3129/

Being an actual star, she can burn and transform any material, including karma.

Changing DNA is a bit trickier, as it's linked to your thinking. A properly performed ritual can change your DNA. To upgrade from "cattle" to something else, you have to remove the cattle thinking and accept a better kind of DNA. 

If you're open for interactions like that, I recommend summoning Belial for this (or anyone of his caliber), he can do it for you if you ask nicely and offer something in return. A good offer would be to allow him to guide you after conversion where he gets a certain % of your energetic benefit as you raise your spiritual level (there will be outbursts of energy anyway, you won't lose anything from dedicating the feedback to your benefactor) then you won't have to offer something you don't have, or accept something unreasonable.

The issue is that humans are pretty much engineered to be slaves, you have to change your race to "demon", "yokai", "vampire" or something else of that kind (drow also works, but the ritual can be difficult to do if you don't know how to astral travel).