I have a close relative who has CKD stage 3a. He is being treated by his primary care physician at Mayo. He watches his diet and exercises. He takes his blood pressure frequently. I went to the Mayo Clinic site and they listed the following things to prevent kidney disease, so I suppose it would help prevent progression as well.

Follow instructions on over the counter pain relievers.

Maintain a healthy weight.

Don’t smoke.

Manage your medical conditions with your doctor’s help.