I am one year after FUE and I believe I can’t have more grafts from the donor area

Yes, it does look like you have pushed your donor area and now have ‘donor site depletion’. I would have to examine you and measure your residual donor density.  I see many such patients both in my office and over the internet. Scalpmicropigmentaiton is the best way to treat this and make it look good (https://scalpmicropigmentation.com/). If you are planning on doing more FUE grafts, make sure that you and your doctor discuss the risks of balding of the donor area.