Since you already experiment with things like meditation and psychedelics, you should look more into finding out more about your psyche and feelings, and other self-development themes. Find out more about your inner being, about the structure of your (and in general, human) soul, what motivates you, what deep fears you have, in what ways are you still unconscious about yourself. There are tons of books, trainings, coaches that can help with this. Basically you should do more "self-development".

There is no innate problem with facebook, slack, or computers or screens or any other similar thing. The problem is that you are getting distracted. You are not fully present with what you are doing. Thinking that facebook is a problem is just grossly misleading.

When you have fixed your internal issues, you will not care how many websites or LCD screens are around you. You will do what you want, when you want it.

Telling this to an average person is next to pointless, because they are so unconsciouss that they will not understand it. They have lost touch with the notion that they actually have a choice of whether to be distracted or not, they have a choice in how to feel in every single moment. Since you already experiment with the stuff you wrote about, you just might though.

For someone who is in deep unconscioussness, who lacks knowledge about themselves, who is constantly distracted and who eats junk food that does not provide their brains with enough nutrition, etc. - trying to do simple dumb things like "I'll only look at facebook 10 minutes a day" - sure it might give some results. But once you've gained some basic groundedness - it just becomes ineffective to look at specific distractors, and much more effective to look at deeper issues within you that cause distraction in the first place.