Duration of nail tips like Dashing Diva

I bought Dashing Diva nail tips a few times because the designs are pretty, the size is just right, and they seem easy to apply. I'm not sure if I applied them wrong or if they just aren't supposed to last this long, lol. Still, they're in the 10,000 won range, so they aren't exactly cheap, you know? ㅠㅠ But they kept falling off in less than half a day after I put them on. Since it's not just once or twice, I'm starting to think I'd be better off just getting a single-color manicure for this money. ㅠㅠ

Please let me know if you have any tips on how to apply nail tips well or how to make them last a long time.