Zed in teamfights

been trying to play zed recently and I'm having a huge problem with the mid/late game. When the enemy is grouped my only option is to pick the adc, mid, jungler, or support... but they're so tightly compacted (and are champs with such great synergy) that it seems like I can't really do anything but attempt to engage just to die. Any tips on being effective late as zed?
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