[Question] What are your greatest one-shot life improvements?

Some­times, peo­ple have life prob­lems that can be en­tirely solved by do­ing one thing. (do­ing X made my life 0.1% bet­ter, PERMANENTLY!) Th­ese are not things like “This TAP made me ex­er­cise more fre­quently”, but rather like “mov­ing my scale into my door­way made me weigh my­self more, caus­ing me to ex­er­cise more fre­quently”—a one-shot solu­tion that makes a rea­son­able amount of progress in solv­ing a prob­lem.

I’ve found that I’ve had a cou­ple of life prob­lems that I couldn’t solve be­cause I didn’t know what the solu­tion was, not be­cause it was hard to solve—once I thought of the solu­tion, im­ple­men­ta­tion was not that difficult. I’m look­ing to col­lect var­i­ous one-shot solu­tions to prob­lems to ex­pand my solu­tion space, as well as po­ten­tially find solu­tions to prob­lems that I didn’t re­al­ize I had.

Please only put one prob­lem-solu­tion pair per an­swer.