The Graduate Center at the Graduate College serves as a hub for resources important to graduate students and postdoctoral fellows. They regularly hold workshops to help with grant, dissertation, literature review, or any other graduate writing. They also have tutors available if you need more one-on-one help: https://gradcenter.arizona.edu/graduate-writing-lab
They also offer career development help, mentoring, and financial tools: https://gradcenter.arizona.edu/resources