I just make the beats homie lol, I haven't written a hook in years so I don't think I can help you.

If I did write a song to “Hustlin” I would go with a fast double-time flow for the hook, maybe even do a Bone Thugs style hook with like a singing/rapping voice, not a full blown R&B sung hook but a rap hook with some melody to it.

That idea might sound like shit though once you record it so you just have to try a few different styles and see what works best with the beat. And any topic would go with that beat.