Currently i’m using the newsletter plugin. My emails end up in spam. If I buy a G Suite account and use that email address for the newsletter, will this resolve the spam problem?
Try to install this plugin https://wordpress.org/plugins/wp-mail-smtp/ and connect your wordpress with the mail service on gsuite. I don’t know the details, check the plugin page.
As a Gmail user, you can block spam you receive. And a G Suite administrator can block incoming spam for everyone in the organization — and help prevent outbound spoofed email from your domain.