TLDR: I need to practice dominating others. How did you practice or how did you learn to be aggressive in every aspect of life?

I need to practice dominating conversations, my education, and recreational sports. If you're an athlete you can understand how easy it is to be aggressive in sport, but in almost every other aspect of life like conversation and calm workplace situations it is difficult to translate...at least for me. How do you practice dominating other people and/or making people aware that you do not fuck around. Thanks for reading.