ahsksj passi is already plural! passo (step) -> passi (steps) ~ and a tip would be that most plural forms in italian end in either -i or -e (for example fragola 🍓-> fragole) buttt there is also the case of pesce 🐟 -> pesci…. 🤔 HAKSJSJ

(and idk if you forgot the k with 20 but it was actually 20k steps yesterday 😭 just walked to the bathroom and the soles of my feet hurt so bad rip)