Ajak dia berkencan. Rencanakanlah kencan khusus dengan mempertimbangkan hal yang disukainya. Jadilah pasangan kencan yang penuh perhatian. Biarkan dia tahu bagaimana perasaan Anda. Terus berkencan dengannya dan mengenalnya lebih jauh.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
In order to take your casual flirty friendship to the next level, you will need to ask her out on a date at some point. Ask her out in a way that is casual and low-pressure to increase her chances of saying yes and reduce any awkwardness if she says no. Try something like:  "I have a spare movie ticket to [that movie she wants to go to] on Friday night. Are you busy?" "I don't know if you have any interest in going, but I usually go to the state fair to be slightly less bored than I'd be at home