On the digital side, consider getting into computer audio and the purchase of an external DAC. Both Computer and your CDP could be run through the DAC. Essentially, you would be taking the same route you did with analog, replacing the internal phonostage with a better external one.
On the analog side, you may want to try a different cartridge, one that mates well with your tonearm and phonostage.
On the analog side, you may want to try a different cartridge, one that mates well with your tonearm and phonostage.