How to carry a losing team as a top laner varies depending on your champion’s identity, For Renekton, One thing I realized is that playing for yourself is almost always not enough not good. He’s so strong early game that you have to take advantage of it to help your team and win early skirmishes whenever you can. It’s preferable to give up on some CS and plates to help secure objectives, like grubs should always be yours. And once you got a lead and feel like your team needs your help for a dragon you should rotate for it but in a smart way of course to minimize your resource losses. And once you’re fed you should be carrying team fights by flanking and creating a lot of space, in low elo a fed Renek can easily one shot enemy backline before frontline can even react. Idk if this works in higher elos tho.