How to never mix up similar verbs again

Actually, it's super simple. People always mess up verbs like kimaru and kimeru. It's literally just shape theory. Kimaru ends in 'maru' which means circle, so the decision is made by a round table of people. Kimeru has 'me' in it, which obviously refers to 'me' doing the action myself. It's basic linguistics. If you just look at the phonetic shapes it's impossible to get confused.