Why does my coworker try to include me?

I’ve been an outcast at work from the very beginning. No one made an effort to talk to me and most people seemed to dislike me from the very beginning. Recently however a few coworkers suggested I should join them for lunch etc. Why do they all of a sudden want to see me? I’ve been there for over a year now and no one cared until now. I don’t do an excellent job, in fact my current tasks are super boring and not challenging so it’s not that I impressed someone

Why does my coworker try to include me?
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