Your Ortofon 2M Red is the problem! It’s mediocre cartridge, what else do you expect on such cheap turntable? One of my friend has replaced his 2M (on the same turntable) with Stanton 881 MKIIs and he never looked back since that day.
Find yourself a better MM cartridge and stay away from the modern MM cartridges, buy the best MM from the 80s or 70s. Then you will undergstand why they are so good and why it was a choice for disc mastering engineers over the years. You will not find anything better than AT-ML170 VM OFC or OCC and btw Stanton 881 MKIIs is also great,
read this article first.
Another great high compliance Audio-Technica cartridge is
AT20SLa (it’s my link, but there you can read some info i just don’t want to copy paste here).
What else you can do to improve the sound quality ?
Change load resistors inside your phono stage to 100k Ohms (Vishay Naked Foil resistors available on ebay from texas components - this is the nanufacturer). You will get a better top end compared to 47k Ohm.
You can not make a mediocre cartridge sounds good by changing the cables or mat or anything, except the cartridge itself if you really looking for something better. Everything starts from the cartridge.
But load resistance is important for MM.