You are never getting rid of mice for good. Field mice are everywhere. They're mostly harmless, don't worry. They don't like populated spaces, either, so just being ohysically present and rubbing your scent all over anything will help solve the problem in time.

I'd steer clear of the drowning traps you see online, as they're a crime in Massachusetts. Glue traps are inhumane but they certainly send a message to other mice. Stick to snap traps.