Sounds like you’re asking three separate questions. Change digital, change analog, of change the PL. With digital, you could add a dac. I’d look at RTR dacs as they are generally warmer. For analog, an upgrade of you cartridge would bring a Big Bang for your money and then a phono preamp. As far as the PL amp, depending on your budget, separates might be a good avenue for you to check out.
BTW, what is you budget for any and all changes?
All the best.
JD