Improving Map Awareness by Turning off Mental Autopilot
A lot of times you hear things like "Look at minimap every time you aren't last hitting a CS in lane" but this isn't one of those posts. I realized a while back that before I started a game I would list to myself my goals for the game: Map Awareness, Counter Harass, and not getting caught out for lack of vision. However, when I finally got into game, someone flipped a switch in my brain, forcing me to play on autopilot and forget to perform my mental checklist. I finally got fed up with it and asked myself how I could fix this problem for the longest time, but eventually I grew out of it.
For those of you with the same problem who want to manually force yourself to override your brain's protocol of ignoring every lane I suggest changing your announcer settings to Korean. This way, instead of the "Double Kill" sound ringing through one ear and out the other you can generally realize when you should look at other lanes to determine how to react.
Note: This is just a quick fix on getting you to critically think during games! I still feel that it would be to your benefit if you tried to look at minimap while you're not CSing to tell if you're in a good enough position to trade/harass/all-in, etc!