The only way to stop the health percentage dropping would be not to use it. 2.49TB written over 6 months doesn't sound particularly high to me. However if you think you have abnormal SSD writes, I would suggest going to Task Manager>>>Details tab>>>Right click 'Select Columns', tick 'I/O write bytes. Then just leave Task Manager open all day while your using the computer, if you order your columns by 'I/O write bytes, it should give you an idea of what programs are writing the most data.My laptop is HP 15-ef2127wm, I have been using it for 5-6 months and like every 2 months it's taking 1% of life of my SSD. Is this cause for concern?
What should I do so that the percentage does not drop more? And why my SSD has 97% health?