Please I bought my phone two months ago but my battery health is now at eighty seven and what should I do to fix this problem properly please, need your support
The health is just decreasing drastically and is iPhone 11
I bought my phone two months ago
You bought a used phone that is anywhere from 12 to 48 months old.
Sellers play all kinds of tricks to sell a used phone, including messing with the battery settings to make the battery appear to be in much better shape than it really is.
Replace the battery at an Apple authorized shop when it is down to 80%.
Nothing you can do at this time.