The first thing that occurs to me is that last year was bad for students everywhere due to the pandemic and on-line classes. Starting in September most likely classes will be back to normal and the very beautiful Cornell campus will (I expect) be back in regular session. To me Cornell has one of the most beautiful campuses in the world. However, I did come from a place where cold and snow were normal and something we were all used to (given where you have applied to this does not seem to be the thing that is bothering you).
To me given a 3.8 high school unweighted GPA I am surprised that you got into Cornell and WUSTL, as well as UCB and UCLA out of state. Other top universities such as “Northwestern, Brown, JHU, Columbia, U.Chicago, and U.Penn” seem rather unlikely also.
Schools at this level are going to be academically very challenging. This is not going to vary much between schools. You are doing well to be able to maintain the same GPA from high school at a university as challenging as Cornell. To me this suggests that you have been working very hard. Good job. However, do not expect this to get any easier at any “top 30” university. In my experience it gets harder when you get into upper year classes.
I am also concerned that you have a rather long list of famous and highly ranked universities. You need to figure out what you want in a university other than a high ranking (which comes with brutally difficult academics). There are going to be annoying students and smart students at any university. You need to find the ones that are a good match for you, and avoid the annoying ones. Both will exist at any “top 200” university. Now that the pandemic is winding down and most of us are vaccinated you should even be able to find them this coming year.
My biggest concern is that whatever has been bothering you at Cornell is going to still be bothering you at whatever university you transfer to. Of course this same thing might occur to the admissions staff at the schools that you are applying to.
If you are looking for a higher ranking, I would be shocked that you could get it with a GPA that is significantly below 4.0. Cornell is a very good university with a very good math program (I applied to it many years ago).