So that it becomes the ozone layer?
The ozone layer is stabilized and recovering on it's own.
There is not much reason TO add ozone to it, though I guess we could - at great expense either inject or create it in situ.
The reason it was a problem in the 80s was the widespread use and release of certain gases to the atmosphere. These gases had a terminating effect on the ozone radical mechanism, that is they end the chain reaction. The gases that were worst were refrigerator gases, used for all kinds of heat exchange pumping. Freon, for instance. It was subsequently capped and banned. It is now only used sparingly, it is to my knowledge in most developed countries illegal to use it IF a different type can suffice.
Following that the release of such gases are only a fraction of what they were and the half lifes of these gases in the atmosphere has been passed several times, and the ozone layer has stabilized and is recovering.
That being said, good old Freon was a fantastic heat exchange gas. My office still has a fridge from the 60s that just keeps on running.