Like any other non-essential commodity, tractor prices are fairly variable. Your location, the condition of the machine, brand of machine, and regional biases all seem to have an impact on the prices.
Isekis are tougher to source parts for than other names, and lack the brand recognition of Kubota or John Deere. This doesn't impact the inherent value of the tractor, just what people perceive. Where are you located? What asking price do similarly equipped machines in your area have? How long have you owned it, is it an older import, a recently reconditioned tractor, etc?
It doesn't seem to be an unreasonable price, for whatever that's worth. Around here you probably wouldn't be able to get that much for your tractor, unless it looked like the reconditioned ones do. In your area, you may be underpriced.