How to approach aspect (dokonavý vs. nedokonavý) for a 20-minute daily routine?

I have very limited time each day and I keep mixing up aspectual pairs. I want a concrete strategy to practice this because I’m tired of using the wrong form when I’m trying to express completed vs. ongoing actions. What’s the most high-yield way to drill these pairs given my time constraints? I am asking specifically about learning Czech, not a generic study routine.