Battery health

Hello,

About 2 months ago I bought new Iphone 13pro Alpine Green 256GB. This is not my first iphone, just to be clear :) so that means that I know how to use it. But the problem is that my battery health is already 98%. I am charging it on a regular basis every night before sleeping regardless on battery percent. Everything else is great, battery is holding very well, but I am concerned about battery health, and how to prevent it from further declining.

Thank you in advance.

Best regards,