Try to take Spanish III, AP Gov, AP Lit, and APES. Either take AP Stats or Honors calculus. Add an easy elective or late arrival/early release (to keep a job and save money). That would be a strong senior schedule (remember that senior year is only weighted for rigor, not grades, as long as you don’t get F’s). Having a job is seen as a good EC since few teenagers nowadays manage to do it consistently.
Do you know what you want to study? Last year DUS turned out to be pretty competitive since all the applicants had caught on to the fact it was easier than applying for a competitive major. Some majors consistently aren’t too competitive, especially in Agriculture, Communications, Liberal Arts.