I just don't install apps at all. I have a stock message app, a signal app, that's pretty much all I use for communication. No facebook, no instagram, no snapchat, no whatsapp, no slack, no bullshit. I'm sick and tired of having to find fucking "life hacks" and run through hoops to be not disturbed.
I started somewhat care less about notifications and emails and messages and whatnot. Unless people are in an urgency which I will reply, but normally I just reply whenever I am free. I'm not more productive, I just feel less attracted to the phone.