W3 total cache not working

Hello,

I installed and configured W3 total cache but doesn’t seem to work. When I check my website on google speed test it still shows the same errors.
My website is hosted on IIS and using woocommerce.
Does anyone know what could be stopping the plugin from working?

My website is https://www.zoulama.co.za

https://ww.wp.xz.cn/plugins/w3-total-cache/