Do you have zero hearing ability in the upper frequencies, or reduced hearing in those frequencies?
If you have reduced hearing like when the audiologist tells you you only hear 25% in that range then you are probably looking for a bump in those frequencies from your system.
Brightening your system can compensate and there are many ways to do it with speakers, components, cables, etc. It doesn’t only have to be new speakers with more treble output. There could be more cost effective solutions. You could try a super tweeter on top of the speakers you already own. Or you could add an EQ to your component stack and jack up the high frequencies. The EQ option might only cost a couple hundred dollars depending on what you choose.
The ultra low budget option, and I’m actually being serious here, are Ear Glasses. Google it. They work.