btw- it’s just UW for the flagship in Madison. UWM refers to the system school in Milwaukee.
UW will see a problem with your grades trending downward, especially when you have demonstrated abilities with your ACT score. Huge question about your study habits. Regardless of your native ability/IQ you need to learn how to study successfully- ie how to master material/learn skills to get top grades. All of the extracurriculars in the world do not replace the academics. UW only looks at unweighted grades. You are expected to do many of the most rigorous classes offered by your HS. This way students are not penalized if their school doesn’t offer as many APs, IB et al. Students are expected to do well in the most rigorous classes taken, hence no weighting.
No superscoring of test results either.
By Indian I assume you mean from India or ancestors from there, not Native American. Not an underrepresented minority then.
Hopefully you have good reasons for the grade slide- perhaps it finally dawned on you that you needed to do the work and matured. It may be too late to show a stellar senior year. Could be better for you to finish your application after senior grades are known if possible and still meet deadlines. You are a student who doesn’t want the snapshot of your grades to end with those junior year “bad” grades (btw- some think B’s are bad, others good).