Plz my cell battery level is down one percent only for 2 months plz increase my battery level

Your battery is perfectly fine.

Batteries degrade over time with usage, that's just how they work.

You can expect about a 1% drop per month with average use on an iPhone.

Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.

Why lithium batteries degrade over time.

https://airqualitynews.com/2021/01/12/why-do-lithium-ion-batteries-degrade-over-time/#:~:text=These%20are%20often%20lost%20through,be%20achieved%20by%20the%20battery.

Here are some tips on maximizing battery life.

Batteries - Maximizing Performance - Apple

Did you even bother to read what I wrote or the article I posted about why batteries degrade?

You can't restore battery health.

Does your car battery last forever? Do the batteries in your flashlight or any device last forever? No, ALL batteries will die eventually, sorry if you think that's not fair.