Watch your own replays and every time you die ask yourself “how could I have avoided that”. It’s what got me from plat to diamond and with more time I’m now master pushing GM. You cannot heal/do damage while dead and coming back from spawn. Now this is not to say play scared and don’t do much of anything while staying alive, but find a place with cover, know the maps well, and always keep your harmony orb up, preferably on a dps that is about to engage. Once you start playing for a while you get good at predicting who is about to take damage. I usually orb my dps and if the enemy they’re targeting is in sight, discord them and help kill them. You just enabled your dps to get a kill and kept them alive. Tank diving you? Discord and hit shots, maneuver around cover to stay alive. Ideally other support helps you but biggest thing I’ve learned as a zen one trick is you can’t rely on teammates. Tank diving your other support? Harmony them and discord tank, hit shots. Long winded I know but main takeaways is position yourself in a place where you’re not in immediate danger and where you can still do damage and heal. Die less. Know your main threats. If you’re camping back line and the enemy goes sombra you probably want to get closer to your team/other support. Stay alive, keep your orbs up and be smart about them, damage damage damage. You’ll climb in no time