Applications to Masters in Biology in US and Canada

Hello everyone, I am applying for my Master's degree in the field of biology in US and Canada. It is a thesis based masters and most of my applications requires a professor to mentor. I have been contacting professors but haven't had any luck. Some of them said they aren't accepting any, while the others haven't responded. I am not able to go ahead with my application process. What do I do? #applicationprocess #admissions #approachprofessors