How can I do more damage on tracer?

(Copy pasting text from overwatch university, can just read the bottom instead of the vod)

Code: C8YS82

Map: Dorado

Rank Silver 2

Hero: Tracer

Btag: BaconWater

PC

I have around 25 hours on tracer and I'm trying to learn to play her as I find her really fun. I wasnt planning on trying a VOD review yet but this match seemed a good example. I had around the same kills as my other dps but my damage always seems low. I know my aim is not good but I feel like my positioning could have a lot todo woth it but am not sure the best thing to do differently. Any advice?