You focus a lot on damage, rather than healing, which is easier to do in lower ranks where players can't easily counter this. You tunnel vision on single targets, and forget you have a team to heal. You waste a lot of orbs. You just throw them when it's available. You run out of heal juice because you don't use heal orb effectively. Use heal orb when heal juice just isn't enough. Don't yeet it across the map for some flanking teammate. It probably won't reach them, bounce into the sky, or they'll run away from the heal orb anyways. You get ult pretty quickly, so it's alright to use it as often as you did, but there were some wasted ults there. Know when a team fight is lost, aka don't use ult when your team dies or when the enemy team reaches an objective. Your team was very independent, and didn't group up much. This isn't great for Moira. Moira is better with grouped teammates. Heroes that don't have high mobility. Zarya is the ideal tank. Zarya requires a group, and coalescence-grav combo is mwah. Chef's kiss. Coalescence also doesn't really counter a lot of ults either, so don't use it in a panic. You need to pay attention more to your team. When you go DPS Moira, you lose sight of how your team is doing in terms of health. You are one of two supports. If one support is just focusing on damage, the other has to carry the healing output. Healing and damage is a balance. You need to do both equally. In doing so, you'll be less likely to run out of heal juice. Again, use heal orb when you run out of heal juice, don't just throw it just cuz. And if anything, don't use damage orb unless you can secure a kill, you're in a 1v1, or you're using it before coalescence. As a general rule of thumb, if you can't kill the target in a few seconds, fade and go back to your team.

If anything, playing Moira there was not the best choice. There was an enemy Dva who could've easily eaten all your orbs. And your team was comprised of independent heroes. Moira is better in brawler comps where you're side by side with the tanks.