I would tell them to get involved and learn about the department they work for. If you stay alone in your corner, of course, you will only learn about what is happening in that corner. But if you take the trouble to find out what the organization does as a whole, then you will really have an opportunity to move.
I would also recommend that they get involved in networking. Personally, it was thanks to networking that I was able to obtain another position at the same level, and then was able to obtain promotions.
Those are my two recommendations.