How do I (17M) pursue this girl (17F) who could be interested in me?

Hey guys, so basically there’s a girl who I’m pretty sure is interested in me, but i wanted to ask you guys how I should proceed, because idk how I should act on this.

So for some context, I’m currently a senior in high school, and around the beginning of sophomore year is when we started having some form of contact with each other, and we started off just by maintaining a streak on Snapchat with each other, then we moved on to some banter in person and talking on Snapchat. But things started to pick up after a couple weeks of this. A couple months prior to this, I started working out and decided to start a private story to post pictures of my physique, so I put up a story with a button to join this new gym private story for anyone who wanted to, and she joined. Anyway, I had posted a picture of myself on this private story one day, and she slid up on it and said “Why is bro actually massive.” At this point, it should’ve been clear to me that she was most likely into me if she felt bold enough to personally tell me that my body looks good, but I still had some lingering doubt since I was never in a situation like this before. I never did anything with this, and eventually things fizzled out between us in a few months. She ended up getting a boyfriend, I regretted how I went about the situation, and life moved on.

But a week ago, I overheard some people in one of my classes discussing how this girl just broke up with her boyfriend. This grabbed my attention, so I decided that I’d take things slow and start just by following her instagram and letting things evolve as they happen. Coincidentally though, probably a day or two later, she slid up on a story that I posted on Snapchat, and we’ve been having occasional conversation on it and sending snaps to each other and back. I feel like this is my chance at actually pursuing her and being successful this time, since it seems like she’s still fine with me, but I’m not sure how to proceed, any advice is appreciated, thank you!