I resigned/quit 3 days ago from a company, after having worked there for 6 months, as it was firing people and about to shut down. I got a new job but now I feel as though the new job is not challenging but the company is stable. What are some things I should consider when deciding whether to stay or leave?

My last company was mentally abusive and threw me into a depression. The new company is fine, but the work is not challenging. The work at my last company wasn't challenging either.