How can I pursue her?

In 7th grade I had a crush on a girl in my science cl. Eventually I just moved on with things because in 8th grade she wasn't in my cl anymore and as a middle schooler I really had no other way to be around her. Now it's senior year and those feelings have resurfaced. She has complimented me on my sweatshirt that I made a few times.As of a couple of months ago she started saying hi to me when we p in the halls. I always make sure to smile and say hello when ping her in the halls and she does the same. Tuesday night we both were at the same cafe but in separate groups and I got up a few times to talk to her and her group. At the end of the night she said goodbye to me by name and I did the same. Yesterday I talked to her after school briefly, and I also notice she was looking at me, and when I noticed I just held eye contact for a few seconds. She did that at least two times. How can I pursue her?