Yeah we'd really have to see the replay to know for sure how you were doing in the teamfights etc.
But what I can say is this, considering how bad the others were (lucian was 1/2 decent) you should have way better CS, you should've been on waveclear duty w/ Viktor's amazing waveclear to make sure enemy team couldn't take towers and to get yourself more fed (might have completed the zhonyas in the same amount of time if you had),
You possibly could've itemized for some flat pen, b/c it would be very cost effective since it appears the enemy team didn't build any MR (no need for void staff b/c of this) lich bane is great for taking towers but looking at that enemy team comp you probably werent getting the most out of it in teamfights considering the range/gapclosers on the melee on the enemy team.
If you weren't you should've played around lucian because from the score it looks like he was at least competent.
Other than that as i said we'd have to see the replay. From the score this is my guess as to what happened, the enemy team had a good pick comp, and instead of waiting to counter engage when the enemy engaged, poppy and braum played over aggro and got murdered, if they had peeled well yall should have had a better chance.