Is your heel not properly locked? Is your foot moving around in your boot? Are your skates old and stretched, but you don't have a budget yet for something new?
Try these jam straps! They will hold your heel nicely in place and you will have all the control again.
The double strap around the sole and heel of the boot can be placed exactly where you need them, then the thick adjustable strap pulls your foot down into the boot and plate.
Sold in a set of two straps, one for each foot.