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Honestly, on that kind of timeline, your "best" bet is probably extreme dehydration. But, don't do that.

https://nypost.com/video/tattoo-artist-will-give-you-six-pac...

Scrupulously count your calories, and go on a 1500 KCal/day diet until you can see them.

> What do I do to make my abs more visible within 13 days?

My honest advice: nothing. Going to the beach should be about enjoying the beach, the weather, etc; not about what some random person may think about your muscle or lack thereof. If that's really what they care about, they're probably not worth worrying about.

Don’t. You’ll be fine.