There are some things you can do to enhance the sound quality and noise cancellation:
1) Try other sizes eartips to ensure you're using one that fits well and creates a tight seal.
 2) Make sure you're wearing the earbuds in the correct position so that they create a tight seal. To check if you're wearing the earbuds in the perfect position, take the Tip Fit Test on the Soundcore app and see 
this video for more information.
3) Try the different noise cancellation modes to find one that's most suited to your environment. You can also customize the EQ or use HearID to tailor the sound to your ears.
 Note: In a noisy environment and at a high volume, you may feel that the noise cancellation performance is not as strong.