Leave channels that you’re not required to be in. For some channels it can be enough to disable notifications. (They will still be bold in the channel list when

Leave channels that you’re not required to be in. For some channels it can be enough to disable notifications. (They will still be bold in the channel list when there are new messages.) Going offline from Slack for 1-2 hours a day might not be impossible? That’s a start. Try it and then evaluate after a week or two.