There is an plugin that suggested by the woo-commerce team to protect the website from bots.
Security is the most important concern nowadays for any website or an eCommerce store. Because of automated tools and bots your site does not perform its best. There are lots of automated tools available to make your site spammy. Therefore any website or eCommerce site must have a captcha that protects from automated bots. Google Recaptcha “I am not a Robot” provides the best protection by involving human interaction to solve the captcha. The capacity to investigate and recognize gets to by bots from people, reCAPTCHA shields mechanized programming from hurting your site.
The plugin details https://woocommerce.com/products/recaptcha-for-woocommerce/
Thank you.