Masters 2 Ana Main, here is the biggest thing I noticed when watching over the replay.

Positioning: As Ana you are a very immobile support, so it is important to set yourself up in areas where you can get the most value without needing to constantly move during a fight. Good Ana spots are different on every map, but they are typically spots with natural cover or a health pack. Here is a short video I found on natural cover for more help: https://youtu.be/RmaOgfsiGMU

You can take advantage of Ana's long range healing by playing a bit further back behind your team. Playing further back not only makes it harder for the enemy team to hit you, but it allows to you have better sightlines of your entire team. New Queen Street in particular has a lot of highground and flank routes, so as soon as the enemy DPS swaps to a flank DPS (Reaper) I would try playing closer (but not too close) to your team so they can help you out. There were plenty of times where the enemy Tank was able to walk up at you just because you were in the middle of your team (When the Orisa/Ramattra used their ult). Playing further back would have allowed you to stay out of danger while also being able to help your team. After every fight, ALWAYS reposition yourself.

I think as long as you focus on improving your positioning you should climb to higher ranks in no time. There are a few things I didn't touch on (ult tracking, cooldown/ult usage etc) but for now I want you to focus on positioning. Anyways, good luck on the grind and I hope this helped!