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As someone who supported to gold, it's a mix of preventing your ADC from horrendously feeding, and dumb luck. Half my games in silver had the enemy afk and got me freelo al the way up to gold.
If you're really dedicated to supporting to gold though, you have to know what you're doing, what support synergies with each carry, and you absolutely have to be aggressive 100000% of the time without overdoing it and feeding.