What mechanics to practice next

I’ve been playing rocket for a little under 2 years now and I’ve been able to make my way to champ in 2’s and 3’s. I feel like I have made it this far just because of game sense and defensive ability but I really want to be more threatening on offense. What would you recommend is the most valuable mechanic I can learn, I feel like now that I’m up higher I need to become more mechanical to compete.