Popular websites are target for hackers and spammers all the time.
While you ca not stop every attack, there are set of tools you can use to reduce activity against user site.
IPQualityScore Fraud Detection plugin can help.
It comes with proxy & VPN and payment screening to reduce found.
It can also verify email addresses and detect disposable addresses. 20+ WordPress Plugins for membership sites..
This plugin helps block quality connections.
It protects your WordPress site and WooCommerce store, so it can block fraudulent orders.
It gives users fraud score for transactions based on billing shipping detail, IP reputation, and other factors.
It can user registrations, logins, and comments...
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