When you’re a Counter-Terrorist defending a bomb site alone, make sure someone sees the bomb on the other site before you abandon your location. Simply seeing an enemy or some utility doesn’t mean that the opponents are committing to a bomb site.
Sending one or two Terrorists to make some noise is an effective strategy to cause a Counter-Terrorist over-rotation. If no one anchors the site, an over-rotation can create a vulnerable location. Before leaving a bomb site empty, ensure that the opponents aren’t trying to misdirect your team.