How do I play the late game?

Hi I wanted to ask if someone can point me to a video/article about what to do in mid to late game (when turrets are destroyed and there's a lot of roaming). The problem is as a support,I don't really know if I should deep ward and risk dying and not being close to help my team or stay in fights and have zero vision around. Also,it's hard to level up as a support in mid/late.
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