Are you still using a back-up diaper? If so, ditch it. I've never had a kid complete while still wearing diapers. When I saw one of my kids starting to wet, I'd tell the kid to wait, pick them up, help them with clothes, and then sit them on the potty. I'd then reinforce the sign the kid used for the potty.
Otherwise, lots of reminders and lots of potty trips built into the routine.
Partner to R ('03); Parent to T ('07), A ('10), and E ('13)