Hi! I'm Sam, your friendly Samsung Customer Service guy. I'm sorry to hear that you're having some trouble with your Bluetooth headphones on the Galaxy A52 5G.
If you head to Settings > Sounds and Vibration > Volume, is your Media volume slider at a suitable level? If so, tap the 3 dots in the top right > Media Volume Limit > On > Move the Slider all the way to the right to see if this helps. You can also try swiping from the top of the screen to the bottom > Media, and check the volume slider for the headphones here, or head to Settings > Connections > Bluetooth > Tap the cog next to your headphones, and check your audio levels. Let me know how you get on.
Had your problem still exist, we suggest that you do some reset on your connection settings, and clearing your cache partition first. If it still didn't work, we suggest that you do a FACTORY DATA RESET of your phone (make sure to BACK UP all necessary files/data first!).
Hope this helps you! Be sure to click " ✓ Accept as Solution" when you find an answer that works for you. 😊