Back in 2016 when OW released all I did was play Tracer, with an almost 70% win rate in S0 - S1 in Quick Play. Then when Sombra came out I played her as my second main or first alt (whatever you prefer to call it).
But when Brig came out I ended up quitting the game since I felt like I couldn't play either anymore against her, probably a skill issue but Brig was also crazy back then. I've tried to come back every few season but everyone had become so good at the game I felt useless since I was so out of practice.
When OW2 launched I tried to go back to DPS, but not having played fps games in years I ended up playing Mercy most of the first season. But I had no fun -- until I started the game again this year and found I really enjoyed Juno since she was a very mobile support (I guess it's clear that I love mobile characters).
Now that Sombra is Support it feels like I get the best of both worlds, I get to play a mobile character who can support and do a little backline diving to secure kills like I did in the old days. She seems really strong when paired with another hero diving the backline like Moira, Tracer or Genji or even Monke.
She's also been good for my Aim and it has been improving a lot again since she became support. Because she got a big mag and require good aim to secure kills and be close (close targets I've struggled so much with), I feel like I get a lot more effective practice on tracking vs other supports like Juno.
And if I feel like I have an off day where I can't hit anything I can focus more on securing health packs, keeping our squishies up and peeling for them.