How to itemize vs 3 tanks and 2 carries as an adc

So let's say i have a marksman and the enemy has 3 tanky champs like maokai top shyvana jungle and braum support, while they also have the enemy adc and a midlane oneshot assassin (zed fizz lux etc) how do you itemise against all these beasts? Assuming my team doesn't deal enough damage to finish them off
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