My website is experiencing a listbombing attack, and hundreds of new email addresses are signing up for our newsletter, both fake and real.

(we use ConvertKit and Wordpress)

I am looking for help implementing:

NeverBounce verification

Invisible reCaptcha

Honeypot

Rate limiting

And / or any other security measures will help solve the problem, based on your guidance.

Please provide examples of other similar security projects you have worked on.