Original: The topic was so broad and gave me the chance to deepen my understanding of Real Analysis, Functional and Harmonic Analysis, C*-Algebras, Amenability Theory, and Manifold Geometry; I can say these subjects form my research interests, now.
Suggestion: The topic was very broad and gave me a better understanding of Real Analysis, Functional and Harmonic Analysis, C*-Algebra, Amenability Theory, and Manifold Geometry. These subjects are now my research interests.
It may be good to review the differences between "so", "very", and "too". Hope this helps!
-geoff