There's not much to change there to actually make it "more GDPR-like". It already does what GDPR wants to cause, i.e. you don't gather Personal Data, with the only exception being the email, and given that it's not operating as an organisation it's probably in the clear.

Maaaaaybeee you might want to strip last octet in IP number from logs, but that's pretty much it.

Complex GDPR policies are only necessary when you want to store and process Personal Data.