On your turntable, do you have a VTA adjustment to adjust the rake angle of your tonearm? If your platter is slightly low and your tonearm is slightly low on the cartridge side, it’ll increase the highs and thin out the low/mid. If you were to raise the platter up, it would increase the low/mid and tame the highs a little. The alternative is finding a thin junk record to boost your effective platter height, and remove it if playing thick 180g albums.
Another trick I’ve found with solid state gear is to leave it on all the time. Things seem to smooth out as they’re left on for several days. Schiit gear especially so. Not sure if you’re already doing this, but it’s worth a try if you haven’t yet.
Now if you’re looking to actually upgrade some gear, look at a tube phono stage and down the line roll some tubes around as you see fit. Something like a Tubes4HiFi PH14 would be an excellent bang for your buck for an affordable tube phono stage ($500 assembled & ready) with a rich, classic sound. I just built a hot-rodded PH16 kit and it’s beyond anything I thought possible.
https://www.tubes4hifi.com/PH14.htm
https://www.tubes4hifi.com/pre11.htm
When I was upgrading my setup two years ago, I bought a turntable (Schiit Sol) and an overkill nice cartridge (Benz Micro Zebra L) but ran it through a budget Project Tube Box S2 phono stage. When I finally upgraded to my PH16 phono stage this year, I realized the error of my ways in upgrading my cartridge before phono stage. It was like trying to cook a nice steak dinner, but only having a microwave to prepare it. Lol. Anything you plan to upgrade, make sure to focus a few moves in advance. Just my $0.01.
-Lloyd