I’m still learning speaker design, but replacing drivers is not a good idea. The crossovers that control how the drivers combine to produce sound as the full range of the speaker are designed specifically for those specific drivers. Finding different drivers that would match the greater system, without knowing the TS parameters of what’s in there now, would be next to impossible.
Each driver has its own sensitivity rating, and though ideally matched through careful driver selection and use of multiple drivers, there would also be adjustments made in the xo to balance the sound output (multiple woofers increases low output, while the tweeter may be padded down is one such example.)
Likewise, the actual electrical resistance of different drivers won’t match up easily, and again, the xo is designed specifically for those woofers and their specific impedance.
Also keep in mind that the overall box is designed around those specific woofers. Their Vas and Q affect the size of the box as well as the port tuning. There’s a lot more involved than just plug and play with the drivers.
With the right equipment, you can pull the drivers and test them for their actual T/S parameters and maybe reverse engineer it, but you would still likely need to redo the crossover to make it all work properly.
It would be far easier to just replace the speakers with something better suited to your taste and expectations.
Hope that helps!