What to learn after elementary geometry?

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I'm in love with Euclidian geometry. It seem I mastered elementary geometry, the one that schoolchildren learn throughout school. But I want to proceed to learn it. Could you advice me something? As a reference frame, I have read "Elementary geometry for college students" by Alexander Koeberlein. I need something in Euclidian planimetry, just something more advanced. Thank you. That would be really helpful not only for me, but to those who have same type of problem I have.

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Maybe old-fashioned geometric conics? For example, see

Charles Smith's text

Cockshott/Walters' text

Clement V. Durell's text

Francis Sowerby Macaulay's text

Also, look through the books that you can find here as well as here.