How can I optimize or combine these MySQL queries?

It's better to INSERT first, with the assumption that the username does not exist. If any error is caused by a duplicate conflict SELECT the existing row.

If you want this to be fast make sure you index username.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.

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