The first contact with the tool is a bit disconcerting, until the logic is understood, my intention is to use it as a substitute for Mautic for monitoring and automating messages.

One possibility that I really like are the templates that you have already configured, especially the one that allows you to transfer contacts from Mailchimp and then delete them, in this way you get the benefit of Mailchimp's enormous integration and acceptance capacity and full automation, and staying on the free plan.