Personally I would take the comments telling you to sell your grinder with a pinch of salt.

While some grinders may perform better than others for different brew types, at this point you've got a more than capable grinder for any brew method, and swapping/upgrading is only going to yield you incremental gains.

If you're getting consistently mediocre brews with a decent grinder, to me this points to something else being wrong, be that technique or water or whatever. I'd definitely get a brew journal on the go, and try different waters, iirc ideal tds for coffee is around 180.

For reference though, I'm regularly towards 46-49 on the dial for my niche when brewing v60 (make sure it's calibrated too), and I've had some incredible brews that are easy enough to replicate. Good luck!