As much as I agree with oracle as another option that’s a bit like io, I’d never recommend either of them for low mmr, or new players. Both hero’s impact scales immensely with your cores understanding of your hero, something that is nonexistent in low mmr… I think dazzle might be a cool hero for you because it’s like io and oracle a strong heal/save for your Allie’s but also functions as an individual support hero. Maybe something you can have more success with.
If i were you I’d just suck it up and play my 10 ranked calibration matches to see where it places me… I would really wanna know