How do I quit my not-for-profit job as the sole employee left?

Hi everyone

I began a coordination position at a not-for-profit in February. My primary role was to overlook community volunteers in a part-time job four days a week, including some weekends, and also assist in the overall function of the organization, as I was the sole part-time staff, alongside the director and administrative assistant that worked only 12 hours a week due to funding restraint.

My position does not offer any benefits, and I take home roughly $2000,00 a month after taxes. The position started as a work-from-home role and transitioned into the office 3 days a week, but now I'm the sole person at the office as the director does not show up.

A month after starting the position, I noticed that the community volunteers who were paid an honorarium of $500.00 a month barely did any work. I would have to constantly chase them to meet with me online, speak with me on the phone, or provide an update on their monthly activities. The director would continuously blame me for their lack of motivation, asking me to call them, be patient that their busy and so forth, but then I realized that the previous coordinator had similar issues as me, so this wasn't entirely my fault, they didn't seem committed to the role.

Anyhow, I continued doing my best to get them engaged and reach out to me if they required any support. Still, we barely accomplished anything; instead, the director placed all the pressure on the admin guy and me to perform events, stressing us out to accomplish all of these tasks for her.

Updates
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When I did some work, I noticed that the director would ask me to redo everything as it didn't look how she liked it to look, and then the admin guy faced the same issue. Now that we work in the office a few times a week, the stress has increased, and the Admin guy is leaving in two weeks, so that I will be solely an employee.

She is delegating me to recruit five more community volunteers, create a partnership with the organization and create a curriculum all before the year ends.
Updates
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I feel overwhelmed and thankfully have an interview for a new position this Friday, so I'm hoping I d get it and would give in my 2-week notice, however, do I write a short statement and if she asks why I'm leaving what do I say?
How do I quit my not-for-profit job as the sole employee left?
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