To create something, you need focus. I do my journaling on paper because a sheet of paper will not suddenly interrupt you with an unimportant message. When I am in focus mode, I have notification off on my phone and my computer. When writing on the computer, I use the “focus” mode in Word that removes all the menus and covers everything on my screen but the document.
You need to take a moment to figure out how to bend your technology to your will. If you can’t figure out how to disable notifications and noise, have a friend or family member help you.