Training during an Ammo Shortage
Dry Fire
Top instructors recommend dry fire training even in times when ammo is plentiful as it is a very good way to improve your mechanics and trigger press.
Dry Fire Drills
You can preform almost any drill that you do live fire as a dry fire drill. Remember always follow safe handling rules and double check that the firearm is empty.
Going Beyond Standard Dry Fire
In recent years there have been many new traing aids that have hit the market that take dry fire to a new level. Every thing from lazer guns and reactionary targets to small electronic sensors that measure your movement.
https://mantisx.idevaffiliate.com/idevaffiliate.php?id=146
State of the Art
I have trained with plastic laser guns and brass laser cartridges, and they all have their place. However I find that a device that doesn't look at the target but rather looks at my technique to have more value. These units called the mantis X are being used in training by both military and law enforcement around the world. If you would like to know more check out the link below.