Ampullary Adenocarcinoma

How do you stay strong fighting stage 4 ampullary cancer at 73?

I'm 73 years old and I have been diagnosed with stage 4 ampullary cancer which spread into my liver. I get chemotherapy treatments every other week and have had 40 treatments. My CA19-9 number when I was diagnosed was over 5,000 it now is 122. I get a CAT SCAN after every 4th chemotherapy treatment. The scan has shown continued shrinking of tumors in my liver. I refuse to bow down to this disease.