However, applying for a degree is more than just looking at the report card. If you have a good research background and papers, especially practical work experience, the school will also pay attention to you. At most, it is to make up some math courses required by American schools.
In addition, there are too many schools in America, and there will always be some schools interested in you. It is very valuable to put more energy into your application materials and show your ability, especially the results of practical research, no matter how small.