WHat was i supposed to do in this game?

https://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/4148108822/2191866742665568?tab=overview

what what i supposed to do in this game?, i left top to help bot lane- boom my tower is gone. i tried to help bot lane, boom 1 shoted so as my whole team.

i try to cover mid, boom corki goes top and dies to eve

i tried to ff, nobody wants to ff

21 minute, enemies finally destroyed the nexus