How do I increase my speed with drawing?

It takes me around 4 hours to get lines on canvas without mistakes. But how do I speed up my rendering?
We break it down into sections how fast should each step be? Sketch. Lines. Rendering.
What shortcut brushes/tools would you recommend? There's so much competition on Twitter I'd like to be just as fast as the professionals.
And don't say AI you fucking faggots.