Finding a job after graduation

I (24F) finished my master’s degree in Environmental Science and I have a bachelor’s in Biological Science. I graduated in August and I have applied to jobs inside and outside of my field. I do have customer service experience from working part-time throughout university, but I can’t even get an interview. I have a mentor in the field that I am interested in and she has looked over my resume and thinks it is good. I have gotten rejection emails that say my experience is impressive. I am just wondering if there is anything else I can do to improve my chances of getting a job in any field at this point.

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