a PSA didn't do a thing for me. My ENT said to try using earphones and turning up volume or bass, treble etc (he said to get good earphone, not a set of cheap ones as the better ones filter out white noise, etc). Earbuds work for me as I can boost the volume and I can even use the equalizer settings or record/microphone option on my phone if I have to.

Have you had a hearing test by an audiologist? That would be my first step as it can determine if you need a hearing device (of any sort) and for what tones, etc.