Is This Anything? 17
I'm convinced that some amazing ideas never catch on because they have a terrible, unmemorable name. One of those ideas is the (principle underlying the) Wason Selection Task. If you can think of a catchy name for it please send an answer by email or comment, I am desperate for this.
Most of the people in my life are conflict-avoidant (I suspect it's most people in the world, honestly, but there's a chance this is just an example of self-selecting groups).
Accordingly, it's relatively rare to hear anyone directly contradict anyone else on a matter of importance – if someone passionately exclaims X, mostly other people will not-disagree out loud, even if they passionately disagree internally.
The upshot is that the people with the most confident views can't easily tell how popular or unpopular their opinions are with everyone else; I think often they go around feeling gobsmacked that 1) everyone agrees with them about X, and yet 2) the world still doesn't understand.
Of course, there are also lots of things that everyone in the group does agrees about – "pizza is delicious," "Jehan is handsome" – so it's not like "nobody contradicts me when I passionately advocate X" is a sign that people necessarily disagree. But I still think there's signal to be found here, by trying to figure out which things you go into conversations assuming everyone will agree with, and questioning whether they might feel differently if you came in less strong.
A nice thing that is easy to forget to do: when someone does (or is) something nice in your life, think about who introduced you to that person and send them a note.
E.g. A few times now I've connected two people who live in the same city, and discovered only years later that they became good friends, sometimes without even knowing they even met up in the first place. And I'm sure I've similarly forgotten to thank people for an intro that led to a friendship, I don't think it happens unless you actively try to remember to do it. But it's so nice on the receiving side to hear "by the way, me and Jo hang out all the time now, thanks for putting us in touch!"
One additional benefit of sending a note to thank someone when a different person does something nice in your life is that it gets through the defences of the Person Who Doesn't Easily Take Compliments type.