Hello,
Before you start buying equipment and cables why don’t you just adjust the VTA/SRA and / or do the most simple adjustment of the VTF (cartridge weight) you will be so surprised how much you can change the sound. My personal recommendation would be pay a professional like ttsetup.com to make sure your cartridge is setup properly. Also, Now that the weather might be changing where you live you might want to check and see if your turntable is level. The easiest/ cheapest way is buy a ball bearing and put it on the platter. Adjust until it doesn’t move. If you do not have feet that can adjust use playing cards and sheets of paper. I hope this helped.