Looking around for other teams is a good start. But it isn't enough. Not by a long shot. Here are the questions you should be asking yourself:
a) Am I dropping cool even if it means I have to leave my jump master?
b) Am I dropping into the center of the map or on the edge?
c) Am I playing a mobility legend?
d) Can I or someone on the team scan for enemies?
e) Do I or the squad run headlong into new areas or do I/we stop at the edge to surveil?
f) If I see enemies should I instantly attack them or should I consider retreating and repositioning if the circle and timer allow?
g) How often in general do I see enemies before they see me?
There are other subtle variations of these questions that can lead to some pretty critical information and to better decision making. Obviously you will have a very difficult time getting squadmates on the same page. Everyone in this game seems to want a hot drop and early death. But that's on them. It doesn't have to be on you unless you allow them to force it on you. In which case you lose the right to complain about multi-squad pile ups. I decided long ago that playing cautiously and thoughtfully was a real skill set and one that I could get better at over time - unlike aiming, where you either have a xim and a bottle of Adderall or you don't. And that skill set has proven over and over again to be worth more to me than "teamwork" when the overriding characteristic of randomly matched players is "early-game suicide run."
And all of this is by way of saying that if you master these skills then you will never get third-partied again. Except maybe in the final three if you don't have the right position or a good place to lay low. But if your jump master chooses some center-of-map dumpster fire, and if you choose to go along with it, especially in pubs, then there will be four or five squads on top of each other. Period. You know this. The question now is, are you going to keep doing it or find another way, even if your team insists on the one millionth failed attempt at a YouTube glory roll?
I know this is a radical re-think. I know that most players couldn't change their run-and-gun play style if their lives depended on it. But I'm putting it out there as food for thought. Make of it what you will.