How to climb as DPS SILVER

I've been playing sojourn a lot around 40-50 games this season in bronze-silver , but I haven't climbed at all I'm pretty stagnant. I don't vod review or anything but I'm typically highest damage in the game, and most elims. I'm a platinum 4 tank playing only ball and platinum 5 playing only lucio support but I'm silver 5-3 constantly on DPS and just can't climb. My positioning can sometimes be bad like I fight 1v3 on objectives but its only because I think it's correct.

I really struggle into D.VA and Bastion, and maps like Illois. I'm wondering if anyone can give me tips on those maps, my main focus right now is just improving my accuracy and general positioning. I'm coming from Overwatch one (THE OG) so I'm still learning the layouts of the new maps and improvements to old ones. I've read guides on Sojourn but I'm also wondering if anyone can tell me how to be using her dash and what perks are good on her.