I have to be honest soraka is such a crappy support for carries at low elo
If your ADC is good then yeah soraka might be pretty cool since she has global ult and stuff, but if your ADC is bad she pretty much becomes semi useless. I can think of so many more champions who can tank, be useful, and outplay soraka like Braum, Blitzcrank, Thresh, prob sona, TARIC. Like if the enemy team has 3 of your players dead and is pushing lanes and you have soraka and someone else alive, youre less likely to survive that fight than if you had a real support.
They can carry if your adc is trash and half the time they usually are. Also they scale well with CS which is important because in lower elos you're going to be having to clear waves because people generally are very bad at pushing lanes back or don't understand the importance or just don't look at their maps.
in that capacity.
. This build gives me roughly 330 AP, 150 armor, around 3600 health, and a little bit of magic resist (dont need too much since my burst and tank is enough to take our most AP champs.
and stock up on snacks
and as long as your adc is aggressive you can control your lane. Then with her short cooldowns you can spam Heal on your allies and Meteors on your opponents and be a game changer in the team battle.
She is decent defending turrets, since her attack spells both do area dmg she can chip away multiple champs &minions together