Even if I went back to being poor again, I’d probably still work hard to become a billionaire.
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of poor? It's poor.
You know the word 先ず (まず)? It means something along the lines of "first of all." So, if you're poor, first of all (まず), you're going to want to get some help. Second of all, learn how to play the guitar and make funny jokes.