What kind of narrative do you prefer, more realistic and raw or with some lighter elements?
Anyway, "Acciaio" by Silvia Avallone is a good starting point - it follows young people struggling to find stability in the Italian job market, even though the story is set in a broader context. "La provincia del disagio" by Ermanno Rea instead really dives into precarious daily life, into the struggle to make ends meet. More recent, "Questo è il nostro mondo" by Edna Pozzi paints the reality of those living project to project, always on the edge.
If you're looking for something more direct and contemporary, try authors who write for literary magazines or indie platforms - they often tell very raw stories about precarity because they live it firsthand. Even novels born from podcasts or online serials lately tackle the theme in a less filtered way compared to traditional publishing, if you can find them. The risk is that finding specific titles is difficult because they're more fragmented, but the added value is that they really capture the emotional state of someone like you who lives with contractual instability.