thank you so much for helping me out with my doubts:
I think I'll go with the "manual" option at the beginning (feels more personal, let's see if this time they listen), and set up an automatic reply only later on if the suggestion doesn't "take".
This I'll do straight away, thank you.
Time to unsubscribe to a bunch of newsletters, while I am there!
You are right, of course.
Back when I left Facebook and Instagram, I got rid of some of my accounts for other services (like Tumblr), but some are hard to leave behind, especially Twitter and Reddit that I still use regularly.
I have built some sort of relationships on Twitter and there are people I won't be able to get in touch with anymore if I abandon it, while Reddit has trhiving and helpful communities on sujects I am interested in, like Manjaro Linux, gaming, and so on.