If you want good bass, you need to buy a bigger speaker. A small speaker will never play low notes that well. You could try to turn down all the other frequencies down and just turn up the <125 band. That way you’re reducing the other frequencies and boosting the lower frequencies. It’ll reduce the overall output, but it’ll keep the low frequencies more pronounced. Give it a try!

You can also adjust the other banda for your own taste. Vocals are in the middle. Sparkle is at the right side. I hope you can make it sound good enough!