“Stay in your lane” is an idiom that means “focus on your own business.” It’s often used to advise people to avoid getting involved in other people’s affairs, or to remind them that they should focus on their own goals and objectives.
The saying has been around for centuries, and there are many different variations of it, however the meaning is consistent across them all. In today’s world, “staying in your lane” is valorized: it implies a sense of self-awareness, focus, and discipline. It can also be a way to avoid conflict or drama. If you’re not paying attention to what other people are doing, you’re less likely to get involved in their problems.