DIY advice: Cold shocking your carpet
Carpet fibres work similarly to human hair. You can lock, flatten, wash, blow-dry but also squash them. These dents in a carpet created by heavy furniture are harder to remove than you think. Simply using your hands often won’t work. The law of inertia will always flatten the fibres out.
To bring your carpet back to its former glory you’ll have to open your freezer. Ice cubes are the answer. The cold shocks the fibres and makes them immobile. When they thaw, the fibres get relaxed and return to their natural shape.
Make sure to thoroughly vacuum your carpet before getting out the ice. You’ll need some patience, as the cubes need to completely melt. The easiest thing is letting them melt overnight. Properly brush the affected fibres at the end and your carpet will look as good as new.
In case you don’t have ice cubes on hand, letting cold water leech into the carpet for a while also works.