Tips on how to carry from behind?

So I can't control how my teammates play, regardless of how many times I tell them "try not to 1v3," "don't overextend," "stay back and farm" etc. when they're falling REALLY behind in lane and, well, everywhere else too.

So how should I try and play in games where my team as a whole has fallen behind, but I specifically have a lead on my enemy laner?

Should I transition it into roams/ganks more frequently? Should I just AFK shove my lane and try split-to-win? Should I hoard all the resources to myself so I can get a considerable item lead, even if it comes at the cost of them just falling further behind?

Atm I build gold income items so I can share farm if I need to, specifically relic shield to share with anyone who roams or coin line so I can give away cannons/kills more safely. I need to do more, obviously, though, but as of now I'm not 100% certain, going forward, on how to improve my play.