At your fitness level, you're more than capable of doing a long bikepacking trail.
The hard part isn't really fitness (for any moderately experienced biker unless your trip has a specific time or FKT goal), it's the logistics of food + shelter, the mental grind, and dealing with possible repairs.
The hard part isn't really fitness (for any moderately experienced biker unless your trip has a specific time or FKT goal), it's the logistics of food + shelter, the mental grind, and dealing with possible repairs.