How to win as a support???

I'm in gold elo and every time I go mid or adc, I have a good time and I'm able to carry games with decent to great KDAs (depending on my picks). As soon as I choose support as a role (I play soraka/sona), it's almost impossible to win games. I feel totally reliant on my team with little to no impact to carry. I check my position, try not to get caught but as soon as a team mate engages or gets caught it's RIP. I don't want to look for a duo because most ppl are extremely toxic so...any advice?
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