Due to injury and illness (me) and illness (family) last year, my total range time - compared to previous years - was severely curtailed.
Didn't shoot any type of match in almost a year, and didn't take any classes during that time either.
But I did get to the range almost weekly.
Decided to work on drills during that year, and used these:
http://www.combatshootingandtactics.com/standards.htm
What I would do is pick maybe 3 of them to practice each session, and I used a timer.
My times and accuracy did in fact improve.
Found it also helps to have a shooting buddy there to compete with, plus run the timer and record scores.