Be cautious of random "MP3 download" sites promising FLAC. They often upconvert low-quality MP3s to FLAC (which is like putting lipstick on a pig). You cannot restore data that has been deleted.
To get your hands on the official, high-quality FLAC version of the song, look to dedicated high-fidelity platforms: sabrina carpenter taste full extra quality song flac
For the best audio quality, you can purchase and download "Taste" or the full album Short n' Sweet from official high-resolution music retailers: Be cautious of random "MP3 download" sites promising FLAC
If "Taste" by Sabrina Carpenter is indeed the song you're interested in, and you're looking for it in FLAC format, here are some steps you can take: high-quality FLAC version of the song