Iphone 12 Battery Health

i have an iphone 12 and bought it im January. The battery was fine until June and my battery health was 99%. Ever since I updated to ios 14.6 it dropped to 94% in 2 months. I updated ios 14.7 in case it would get fixed, but now it dropped to 93%. It has only been 7 months since i bought. I had my previous xs max for 2 yrs and it only dropped to 92% within those 2 years.  should do something about it. What can I do to prevent my phone battery health dropping so fast. I only use original charger and cable.