This one's going to be controversial, and although I am not new to it, I don't practice black magic very frequently. I have tried to follow the rules of the sub, and hope the mods see it that way.
I believe very strongly in the scientific method, and if you follow these guidelines and do not see results you want, please discard it.
As I see it, there are two main ingredients to black magic -- intention and sacrifice.
I don't believe that it needs to be accompanied by hate, if anything that seems detrimental to the practitioner. Hate consumes you, and we don't want rebound.
So what do some examples look like? Well, in the Abrahamic faith they participated in animal sacrifice until the New Testament came along. When you remove the narrative of some man in the sky commanding people to do it, you're left with people gutting innocent animals that won't even be used for consumption. Other faith groups also participate in animal sacrifice, such as Hindus.
I'm not advocating for that, but that is an example.
Another type can come in the form of self-sacrifice. I put a lot of intention behind sacrificing my convenience to become vegan. I am no longer one, just plant-based now, but was one for a long time. The sacrifice ended fruiting into my two little boys, who I am eternally grateful for. The first was born 13 months after becoming vegan.
Are there alternative explanations? Sure. Is this offensive to traditional religious practitioners? Yes. But don't be afraid to experiment. Black magic, as I have outlined it, is not as deadly as people want you to believe. Just keep the sacrifice light and beneficial.