Where do I find a replacement for this piece?

Where do I find a replacement for this piece?

So a small white plastic piece came off and when trying to put it back, it broke. My Switch Lite doesn’t turn back on so I’m guessing it was important. I’m not sure how or where to replace it or if I should buy another part to replace it and if so what part. I’m just confused and not sure what to. Help, please.