I'm not happy with the current role that I'm in. Should I just leave for better opportunity or should I stay for the bonus as the year is ending?

A better opportunity should offer you a good balance in both learning and earning potential. And if you’re already inherently unhappy, best to move on quickly before desperation and burnout gets to you.

You can start looking for a new role and price your potential bonus into the salary package or even negotiate a signing bonus.

Job search tend to take time as well. So no harm starting early and going for a couple of interviews to gauge your “market rate”.

I think that if money is enough of a motivation for you to sit on the fence for this, then you can probably hang in there till the bonus while looking for greener pastures. But if you can't imagine spending another day at your current workplace then it's probably clear that your sanity takes precedence over the EOY bonus hmm..

1 month or 2 months is still $ good for investment and returns. Negotiate with new potential hirer to wait for you after bonus. If you're wanted, they will either wait or even give you a welcome bonus to join immediately. No harm discussing with new potential employers if offer is confirmed.

Depending on the amount at stake, and what the other side has to offer.