(also I haven't looked too closely, but I'm p sure gdpr doesn't cover your work chats and etc because those aren't your chats on your accounts, those are your employer's chats on your employer's accounts on your employer's platform and your remedy is to work somewhere else. I'll happily take your place. Deal?)
Assume every line you send in a work email is gonna be read out loud by you in open court some day, and assume every line you send in a work email is gonna be parsed by some unthinking automation who only looks for keywords. You know, like ChatGPT, or your standard garden variety HR worker.