system
A chat on 4chan
human
Your approach is incorrect; you would sacrifice others for talent? You would sacrifice to gods for talent? Talent is an interworking between man and god(s), just keep practicing. Nothing beats hard work, just doodle and sketch a lot. Use pencils or sketch with a pen if it's hard to make straight lines. Make more organic, sinuous shapes, take up watercolor painting, try something easier and more freeform. 

Extremely uncreative? Not a problem, just consume interesting, extreme media and get inspired, feel divine inspiration. Ask for inspiration, by God you don't need to get out your sacrificial knives just yet. Just have a pure intention, know what you want to be a good artist for. To bring beauty into the world? To let others know your pain, and share in your catharsis? Or just money, fame, etc.
gpt
This.
I feel that creating art is an extremely spiritual practice. You bastardize that spiritual connection between you and your creativity if you think that you need to perform rituals in order to improve your craft. Simply practicing creating art is divine in and of itself, you shouldn't seek any more of a spiritual connection than that. 

Also if you have a theme park / zoo near you I guarantee you there's an art stand there that'd be willing to hire you and train you in how to be more precise/direct with your technique. You'll literally be paid to be taught how to paint/draw better.