Chaotic keep working on your Sona, mainly the whole "not taking kills part".
Great supports make or break bottom lane. You can turn a decent carry into a good one by being a great support. Things you should work on:
1.Knowing matchups. Knowing when you can be aggressive and when to be passive is huge. If you're Sona/Trist vs. a passive land like Soraka/Kog then know you can mass murder them. Poke them every last hit and force them out of lane or to zone themselves. On the other hand, if you're against something like Alistar/Graves then know you have to play passive because the burst is too much.
2.Know when a good time for Oracles is. An early Oracles can really help bottom lane snowball. If the enemy knows they have no wards they know they can't be aggressive. This forces them into mistakes and bad plays.
3.Know when to use Sona's ult. That thing is game-breaking. You want to use it early but never on just one person. Try to catch 3 people in it because no other support can do what you do. You add an ultimate that is AP Carry worthy to the team and its power is immense.
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Realo won gold at the Sex Olympics with a BROKEN FRIGGIN NECK.-Voltch