Our marriage has only just recovered after a crisis. Is this a suitable time to take another wife?

A marriage that has just recovered is usually still fragile, and adding a big change now risks tearing down what has only just been rebuilt. Trust that is being restored needs stability and attention, not new shocks. Give your relationship time to become truly strong, and make sure your wife and children are in a calm place first. If the wish for polygyny is still there later, reassess it honestly once things are stable, with the right intention and ability. Rushing at a fragile time usually tests your fairness at the hardest moment. Put strengthening first, not shaking things up again. See counselling.