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All rechargeable batteries are consumable components that become less effective as they chemically age.  For more info, see:

iPhone Battery and Performance - Apple Support

“Battery life” is the amount of time your device runs before it needs to be recharged. “Battery lifespan” is the amount of time your battery lasts until it needs to be replaced. Maximize both and you’ll get the most out of your Apple devices, no matter which ones you own. See the "Tips for Apple Watch" section in:

Batteries - Maximizing Performance - Apple

Bettery99 wrote:

I want my iPhone 11 Pro Max increase bettery health

Battery health, in the long run, always goes down. It will keep doing so until the battery is no longer fit for use.