Unless you’re traveling and/or away from your computer for a long period of time, email only gets checked and responded to on a computer, not the phone. Remove email from your phone.
If you need to respond to email quickly for a good reason, create an email address that only gets shared with certain people. For example, I have an email address that I give to people wanting to book me to play music gigs. It’s advantageous for me to get back to them fast, so that email pings my phone.
Facebook
Unfollow all friends, groups, pages. Your news feed should be completely blank. This may take 1-3 hours but completely worth it. All means ALL.
Bookmark any friend’s feeds you want to see, then visit them through a URL, not the news feed.