How much Ethereum should I buy to be a millionaire?

I've been hearing a lot about Ethereum lately and I'm really interested in investing. But I'm not sure how much to buy. Do you think I could become a millionaire if I invested in Ethereum? What's the magic number I should aim for? Should I go all in or start with a smaller amount and gradually increase my holdings? And what are the risks involved? I'm new to this whole crypto thing, so could you please explain it to me like I'm five? Thanks!