No, unfortunately, you are not eligible to receive the American opportunity credit because you have already completed the first four years of post-secondary education (you earned a bachelor's degree) as of the beginning of the taxable year (2017).
According to IRS:
"Q12. Who is an eligible student for the American opportunity tax credit?
A. For the American opportunity tax credit, an eligible student is a student who: (1) is enrolled in a program leading toward a degree, certificate or other recognized post-secondary educational credential; (2) has not completed the first four years of post-secondary education as of the beginning of the taxable year; (3) for at least one academic period is carrying at least ½ of the normal full-time work load for the course of study the student is pursuing; and (4) has not been convicted of a felony drug offense."
https://www.irs.gov/newsroom/american-opportunity-tax-credit-questions-and-answers
