S and S+ for Supports

Im trying to get lvl 7 on {{champion:40}} but it seems impossible to get a third lvl 7 token, what am i suposed to do as a support to get S or S+? Im not suposed to farm or get kills as support so how can i get S then? My avarage ward count are pretty good and i have good stats and i get A+ mostly, i know what you need to do to get an S but it seems impossile as support...
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