If your Bluetooth speaker is not loud, it may be because the volume is set too low. Make sure to check the volume button on the speaker and adjust it to a higher level. Additionally, you can try using an app to boost the volume or adjust the audio balance with an equalizer. Another option is to use a speaker with higher wattage, as this can provide louder sound output. By implementing these steps, you can enhance the volume of your Bluetooth speaker and enjoy a louder audio experience.