Well, it all depends whether or not you’ll enjoy said National Student Leadership Conference thing. If there’s something else you’d prefer doing, then go ahead and choose that option.

Or is there something holding you back?

Honestly, I don’t think I’d want to. It doesn’t really offer anything for writing, which I what I want as a career. So I don’t think I’ll do it.

Then by all means, do what you must to go for what you enjoy most!
It may be a big chance for the NSLC, but if it doesn’t help nudge you where you want to go, then I wouldn’t recommend doing it. óuò
And good luck on your journey to your writing career! I hope you make it to whatever writerly destination you wish to go to.