Restart Your Phone and Car: Sometimes, simply restarting both your phone and your car's Bluetooth system can resolve connectivity issues.

Forget and Re-pair: On your Galaxy A53, go to Settings > Bluetooth, find your car's Bluetooth connection, and tap on the settings icon next to it. Select "Forget" to remove the pairing. Then, restart your phone and car, and try pairing them again.

Clear Bluetooth Cache: Go to Settings > Apps > All apps (or App Manager), find Bluetooth, and tap on it. Select "Storage" and then "Clear cache." Restart your phone and try connecting again.

Update Software: Ensure your Samsung Galaxy A53 and your car's Bluetooth system are both running the latest software updates. Updates can sometimes fix bugs and improve compatibility.

Check Car Compatibility: Ensure your car's Bluetooth system supports the Bluetooth version used by your Galaxy A53. Older car Bluetooth systems may have compatibility issues with newer Bluetooth versions.

Check Battery Saver Settings: Sometimes, aggressive battery saving settings can interfere with Bluetooth connections. Temporarily disable battery saver mode or optimize it for better Bluetooth performance.

Check Interference and Range: Ensure there are no other devices causing interference with the Bluetooth signal. Also, ensure you're within the optimal range (usually around 10 meters) when pairing.

Reset Network Settings: Go to Settings > General management > Reset > Reset network settings. This will reset all network settings, including Wi-Fi, mobile data, and Bluetooth connections. Note that you'll need to re-enter Wi-Fi passwords and re-pair Bluetooth devices.

Test with Another Device: If possible, test your Galaxy A53 with another Bluetooth device to see if the issue persists. This can help determine if the problem is specific to your car's Bluetooth system or the phone itself.