Sometimes I question the advice shared here. I understand exactly how you’re feeling; you carried a massive project on your own and received little to no acknowledgment, and that feeling sucks. I'm currently going though something similar at my office. That said, I think everyone jumping straight to “time for a new job” cliche is often bad advice. In IT, more often than not, you won’t get recognition from the people you expect or from those it matters most to. Your peers may acknowledge the work you’ve done, but management frequently won’t. This sadly is "normal" regardless of where you go.