Baseline I’m finding more .. slowly.
If you want some gravel practice a few good spots along Allen Hill Rd. mitchell rd, hibernia, and arnold hill/buck hill roads are super close and easy rides. You can also jump off on the Terry Mt. trail a the corner of Allen Hill & River Rd, it loops west, then south out to Rod & Gun club. That’s an easier logging trail. More mud/dirt than gravel but not sandy or rutted bad.
A little further west I really like the Goldsmith/CR-26 (gravel) -> Wolf-Pond Rd (loose sand/ruts/rocks) rides.
A little further south I recently discovered a hidden little trail in Port Kent going south off Trembleau Rd. that goes down to the lake and keeps going into Willsboro Pt. Its a pretty easy trail with some decent hill climbs//descents going up and down to the lake.
Let me know if you can’t find any of those, or want to give them a shot sometime!