How to turn a game around when we gain a teamfight advantage?
I'll give some back story so you can explain to me how you would have handled this situation:
Here is the match history: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1594976939/205666521
Thus far both teemo and I have been winning lane with Maokai bringing in some decent ganks but Fiora not fairing so well. Bottom lane isn't doing so well, with Fiddlesticks feeding Ashe Graves is having a difficult time farming. I don't begrudge Fiddlesticks, he was on a new character and Leona is a much better support than Fiddle, so he didn't do anything wrong, however, Ashe is sitting on a lot of money. However, she fumbles the advantage when she decides to build 2 infinity edges back to back then a blood thirster. So, while she hits hard, she doesn't hit very often, and being squishy with no escape, all the money she had gotten was wasted. However, the problem came in mid lane. I had been beating Mord in lane, however when Ashe and Leona started to roam and Fiora joining them, it quickly became a 4v2(maokai came) in mid lane and despite putting up a good struggle, they were still able to beat down our door and take out our inhib using nothing more than attrition. They kept roaming and systematically took out all of our turrets minus the top inhib and nexus turrets. So, with two inhibs down and all map control lost, we could only hold up. However, as a group we were able to win teamfight after teamfight and were quickly catching up in gold. However, with all but 3 of their turrets standing and one, sometimes two inhibs down, it was difficult to leave the base and make a push. The game lasted 35 minutes, so respawn timers were short enough that it wouldn't give us time to make the trip to their turrets and with an inhibitor constantly down leaving as a group wouldn't have been wise. So, there was never a clear point to take advantage of our teamfight wins.
What would you have done? Is this an unwinnable scenario due to the difference in objective control?