Shooting is a perishable skill. You have to keep practicing even to maintain your skill, not just to get better. Take enough time off, and you will have ground to make up.
In another post we talk about how you should devote a lot of practice to dry-fire. It’s free to do, it’s valuable to help with many skills beyond just accuracy, including reloading, drawing from holster and more. We recommend 80% dry-fire to 20% live fire.
But you still need to put time in at the range with a real bang. You should practice at the range weekly or more frequently. Bi-weekly at the least. However, we know it’s hard to find the time and ammunition is expensive. I go to the range at least once a week and spend 30 minutes on my lunch break. There are literally hundreds of drills you can do at the range and dozens of variations on each one. Having a plan before you get to the range really helps you maximize your time there.
Here is a video that suggests a range drill that uses up one box of range ammo (50 rounds) that we like a lot: