By looking at stats of the game including dmg/your team/ game length what champions you are playing ect I see that you probably could have carried the games. Not really looking unlucky you are doing good but dont know the champion as much as the champion you one trick. Especially since you dont spam the same champion so its hard to know enough about the champion to carry games. You did have alot of impact and played pretty good but its more than just that its knowing when to do things. Im guessing you got caught out a couple times at bad points as well when you could carry the fight esp as mf.
Tldr: you could do more and it isnt THAT unlucky. You should be winning those games. Unlucky is where im 4-0 and everyone is 0-4 and the game ends before it starts lol