Hi,
I am in the same position. I applied for 15 colleges and didnt hear back from even 1. I know exactly how you feel.
I am not sure if there is any spring in-take for Biology. If so, you could try that. I am already look for Spring 2021 intake.
This is my second year. So, to say, I have wasted 3 yrs so far and still going. Its mostly because I couldn't hit the GRE score and did not know anything about the admission process and wasted my time. If you have already done so much work, then there is no way it would go to waste. Keep trying!