You won’t be expected to have stem activities. OT for a moment, but your writing pursuits are good and you do have the campaign work. Now if you could take that and the debate and find an issue to get involved with, hands on, in the community, something that impacts need. Less white glove than the museum vol.
But that points to this, for OP, as well. He has science fair/independent research, a couple of internships, that watch program. The neuro at school is a club (for all we know, they sit around and talk.) No other math-sci activities, something collaborative and/or competitive within the hs? Some further comm service?