Can’t win buy box – I’m only seller – FBM

I’m sure this question gets asked a lot.

But I can’t figure out why I can’t win the buy box for my own product.

– It’s a 100% original product with no other sellers.

– I’m selling FBM (only sold 8 units so far) and my metrics are perfect yet I don’t have the buybox.

– I’m a new seller on a new account if that matters.

Anyone have any idea why i wouldn’t have the buybox?