Ask for what you want when you want it. The worst thing that will happen is “no.” The best thing that will happen is “yes.” Even worse than no is regret.
You are the one with the vision, the desire, the means. Don’t wait for someone else to present an opportunity. Create the opportunity and present it yourself.
Proactively moving yourself ahead is a skill. So if you don’t do it right the first time around that’s ok. But learn from the missed chances and seize the new opportunities as they come.