What the hell is this?
Are you supposed to lose games in this game?
So I have been reading your comments, checked your history and as someone who used to main Sona (have 800 games with her) here are my advice
- If you never mastered the basics of support matchups, never go Sona against engage supports like Leona, Morgana, Thresh, Naut, etc because you will lose your lane if you can't dodge their skill shots. Even if you are good at dodging them, you will not be able to sustain the pressure on the lane because their zoniing will always be super later in early game, once your oponent get more items/dmg
- Basic advice for Sona players but :
FOCUS ON YOUR POSITIONING . Never be out of position, never overreach, never chase blindly, never be ahead of your tanks, etc. Sona is very Squishy, do not have escape ability and your opponent will normally focus on you due to your sustain
- Always buy Control Wards. Looking at your history you seem to not focus on that, Control wards will give you so much information and even time to actually make decisions. Jungler is spotted? Play accordingly, Someone is clearing? they vulnerable for attacks, they warded in the area? Good luck having actual vision there, etc
- Always build sensationally, especially your boots. first of all, never buy Sorceress Shoes. You are there not for your dmg, but your sustain and your poke. That shoes will not help you in lane since your opponent don't have any MR for you to penetrate, and it will not help you late game / teamfights because the ones who have MR will always have way more Health than your useless 15+ Magic penetration can have any effect on
- Its best to build tankish in Runes and Mastery (except for Windspeaker Key stone) I honestly don't know why you had Stoneborne as your keystone. You are not tanking shit.
- Always stick to your adc. Your shield is one of the best shield early game. make sure you are in the vicinity of your adc when trading poke with the opponents duo
- Read the map. If their jungler is in bot side of Jungle don't engage. Warn the adc to not extent and get your E ready for you two to get out.
- Get items that amplifies your healing and shields. there are plenty, Ardent, redemption, Mikael's Crucible, Athenes, etc. This will increase your healing ability, and sustain the team when in TF
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Never buy Rabadons Deathcap on Sona. NEVER! Seriously NEVER, its not gonna give you anything except for ap power which you don't need and even if you need ap, there are other iteams with passive that will help you in the game better than that.
- Focus on getting items that have Cooldown reduction. a 40% CD is very helps in teamfights since you can just spam the abilities and your sustain