How to increase battery level for iPhone 11 Pro max?

Battery level is increased by charging the phone. Battery level is the current amount of battery power your iPhone has and is displayed in the battery icon at the top right corner of the screen.

If you mean battery health, then that cannot be increased except by replacing the battery for a new one. Battery health is a function of usage and chemical wear. All batteries age and loose health with time and usage.

If the battery health is over 83%, then its in correct working range and does not need to be replaced.

If its less than 83% but over 80% then it is in low health, but does not need to be immediately replaced.

If its less than 80%, then its below nominal spec and should be replaced.

See here: link-> iPhone Battery Replacement - Official Apple Support

tunza212 wrote:

I’m still waiting

This is a forum, not live chat. Sometimes, as you can see, you have to wait for more than one minute.