TT interconnects and power cords

Rewiring the arm is a possibility but I am guessing that this is not a DIY project for you. Ian should be able to explain your options. I can vouch for the Expressimo Heavy Weight, it makes a very nice difference.

I take turntable mat swaps with a grain of salt. Many replacement mats are thicker than the original felt, and I suspect most of any difference in sound comes from the change in VTA.

But before making changes to your TT (which you haven't had very long, I gather), what is it you're not happy with in the sound? Maybe Ian could let you hear something more upscale, so you can decide if tweaking will do the job for you or if you need more than that.

(And needless to say, this post is just more or less repeating what my betters said above.)

If this P3 were my table, I would be thinking about a cartridge upgrade as a next step. I would be planning to buy the very best one the arm could take, as a prelude to changing my TT, which I would sell with the _old_ cart. I would then mount the better cartridge in the new turntable and listen to it till I was ready to upgrade the rest.

I might also consider a Heavy Weight, but only if I knew my next arm were going to be another Rega.

But I wouldn't think of changing anything while I was still enjoying the music with my current setup. If it still makes me happy, why spend more money?