I have installed plone.formwidget.recaptcha=2.3.0 in buildout file.
I have included the secret key and site key in recaptcha widget which I took from google recaptcha v2 checkbox.
How to include captcha in contact-info form?
How to include captcha in login-help forms?

You will want to create your own contact form, possibly using collective.easyform, and use the approach described under " Replacing the site contact form with a content object" here: Contact forms — Plone Documentation v5.2

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Thanks a lot, it really helped me and rectified the issue

@Vlnni have you checked those packages ? they may be useful for your usecases ...