Does My Substantially Low GFR Level Mean I Have Progressive CKD?

My Serum Creatinine level on an average is 1.5 for the last 20 years. It flluctuates between 1.3 to 1.7. I recently got a test done and my GFR is 41. I have become very worried, because I realised that I am a now a CKD patient and it is a progressive disease. What should I do.