I started archiving completed emails back in September 2021 and have still been using the technique ever since.
You can see that I have hit inbox zero this week too.
Actually, inbox zero does nothing but makes you feel that you have completed your work for the week/day and now you can do something else. Emails lying in the inbox always make me feel that there is still a ton to do but archiving them helps reduce the mental stress at some level.
Today, I will be working a bit on a project and then go out with my friend.