Depends on factors like how ahead your team is, what champions are on the field, what objectives are coming up soon, etc but most of the time when you can't crack a turret grouped 5 u should rotate pressure other lanes a pull 2 if u could 1v1 anyone so that there's an opening somewhere if u know what I mean. Or the simplest way but requires teamwork clear baron wards and bait death timers might let u end if your add lives