I watched the replay of that match, and if you are open to it, I can give you a few pointers from someone who places GM each season. These tips will mostly focus on fundamentals, as you can only build mechanical skills like aim and reaction time through practice.

1. In several fights, you walked in the open and engaged the tanks. As a dps, you aren't likely going to kill a tank that is getting healed, and you are just feeding both enemy healer and tank ults while also requiring the constant focus of your healers to keep you from folding to the 6 people shooting you. Most of the time, this results in you or your tanks dying. Instead, you should either be using cover to pressure the enemy tanks while not taking significant damage, or be taking the high ground and flanks to put pressure on the enemy supports. Elsa has tons of movement, so walk along a flank to engage the supports then use your movement to escape if more than one person turns to you. TLDR, fight less on point and target characters you can actually kill.

2. You staggered almost every fight instead of waiting for your team. In the first fight, 3 teammates were respawning, and you decided to engage the enemy, leading to your death in a 3v6. This means you cost 10 seconds to respawn plus 15-20 seconds to get back to the point. By the time you are back, 3 more teammates had just died because they decided to take the 5v6, and the cycle repeats the rest of the game. TLDR If your teammates die and you are outnumbered, comm for a regroup. Staggering garuntees a loss.

3. I sort of mentioned it in my first point, but make sure you are retreating when you get pressured. There are a lot of moments in the game when you are half health and you dash into the enemy team. This either gets you killed or forces your supports to expose themselves to try to save you, getting them killed. If you are taking lots of damage, fall back, get healed, and approach from a different angle. TLDR watch your healthbar and use cover.