I feel you. Have had the same experience and trying to work this out too (not super successfully, yet).
From my experience the key issue isn't the language you use, it's deliverability. Specifically, the affect of the infrastructure you use.
More context:
Lot's have changed in terms of email deliverability since June 2024 when Google and some other email service providers decided to enforce more strict requirements on bulk email sending (like the need to authenticate emails, to include "unsubscribe" one-click, etc.). This practically means that you need to take specific measures to setup the email inboxes you use to send the emails from in a way that doesn't alert the ESPs to suspect you're bulk sending, otherwise your emails won't even reach the primary inbox of the person your sending them too and then the chances of them reading the emails are existent.
Try looking into this guide. It helped me a lot - https://www.za-zu.com/handbook#creating-email-inboxes-and-optimizing-them-for-deliverability
