Soraka isn't really OP, Supports are just garbage
I've seen a lot of people thinking soraka is OP recently, and while she is a little to strong, I think there are other greater issues that are making her seem OP.
Soraka is literally the only suppport that makes a truly game changing impact (assuming you aren't just wildly outplaying your opponent at all times). Yeah, other supports can make big plays or do certain things well but they don't have nearly as big an impact on the game (unless EXTREMELY well utilized) compared to soraka. She is a little overpowered but in all honesty, they just need to buff other supports that counter her so she isn't so oppressive in the bot lane. Leona for example would be a good champion against her but leona isn't very good right now because supports are underfed, underleveled (that's the big one) peel bots. You can barely even ward anymore and if you do try to become a warder (which still isn't as good as before sight stone update) you sacrifice even more stats to do so. Remember win rate largely compares how strong a champion is relative to their role, not necessarily actual game strength (you will have 1 winning and 1 losing support in every game, so whichever one has a slightly higher impact will overtime develop a higher winrate in such a large sample).
Tl;Dr Stop hating on soraka, shes probably a little to strong but her issues largely stem from not being able to counter her due to poor botlane diversity and weak supports as a role.