While it may seem counterintuitive, the general wisdom is to use glue. Yes, glue increases stiction, but it also acts as a release liner. The glue creates a more brittle contact area, which breaks away more easily. This effect is especially noticeable on a smooth build plate, where the impression is often left behind after removing the model. However, if good plate hygiene (periodic cleaning) is not maintained, some glues can leave residue on the part, which then needs to be cleaned off. For glue sticks, one effective method is to apply the glue first, then use a warm, wet paper towel to moisten and smear it into an even layer.
Another trick I often use is to place the build plate in the freezer for 5 minutes for small models or 10 minutes for larger ones. The steel and the filament shrink at vastly different rates, and most of the time, the model pops off on its own. This is similar to printing a model overnight—when the plate cools by morning, the model often detaches by itself. If your freezer is full, you can place the plate in the refrigerator for 10-15 minutes; the effect is the same.