I am approaching the end of 11th grade. How can I improve my extracurricular portfolio?

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I am nearing the end of my 11th grade year. My general academics are pretty decent, with 12 honors classes, 5 AP courses (my school only offers 7...), and 9 dual enrolled college courses either planned, enrolled in, or already taken. In addition, I have made high As in every class I have taken thus far, and I currently have a 35 on the ACT. However, unfortunately, my extracurriculars are paltry at best compared to the people I will likely be competing against for college admissions.

Some background: I attend a more or less rural county highschool in a developing suburban area, and many competitive programs that would be relevant to me (as an intended physics major) such as science / math olympiads, are unavaliable. I applied to a Governor's school in 10th grade and was waitlisted and eventually accepted, but my parents made the decision to withold me from attending. I also applied to a summer research program provided by ORNL, but was rejected. I also have very little community involvement due to not having access to reliable transportation, and I am therefore unlikely to be eligible for participation in NHS at my school.

The best extracurricular achievements I have are as follows:

- National Beta Club's science convention - I have placed both at the state and national levels every time I have competed thus far.

- Governor's School - At least I was accepted...? I would have attended if it was my own choice.

- NSDA - I placed top three in a local debate competition. I haven't really competed since, though, since I find formal debate to be a draining and wholly unpleasant affair...

- School-level (attempted) leadership: I have ran for vice president in my school's student government every year, I got it freshman year but have failed every consecutive year.

... That's it.

As I'm sure is clear, my extracurricular portfolio is sorely lacking... I wouldn't personally consider any of these points to be major accomplishments, and yet they are the very best accomplishments I have. Is there anything that can be done?

[Edit]: I now realize that I did not make my interests / intended program of study very clear. I intend to enter a STEM field, likely something in mathematics or the natural sciences. I'm not entirely certain what I want to do just yet, but I do have an interest towards physics in particular.