About Slack: Just don't leave it running in a place where you see it and only check it every hour or so. A virtual desktop far away. Turn off notifications.

About Slack: Just don't leave it running in a place where you see it and only check it every hour or so. A virtual desktop far away. Turn off notifications. Mute all channels, except ones that really matter to your work. Feel culturally pressured to respond quickly? Set your status to "in a meeting". That will by default clear after an hour, mind you. Until your company culturally agrees that "I did not meet my expected output because I was too busy on Slack" is acceptable, you are responsible to do what is needed to get your job done.