There's no need to worry as there's nothing you can or should do until your Battery Health rating dips below the 80% rating AND you have not gone through 1000 charge cycles yet.
Preferably, this also needs to happen while you are still covered under warranty or AppleCare+.
There are great variations between how each battery wears down even if they all have the same exact number of mAhs and sit in the same smartphone, running the same software, getting charged the same way, exposed to the same temperatures, same charging behavior, etc., etc.
This is why Apple gives the 1000 charge cycles before 80% rating for iPhones 15 but doesn't get any more specific than that, like going into how much wear you should expect between every singular charge cycle.
Also, thinking that a battery is not wearing down just because it sits at the same Battery Health rating for months on end is a misunderstanding. Your battery is always wearing down. Not even shutting it down and never using your iPhone will fully mitigate all wear and aging.
Forget your battery for now, and then check on it again in 6-12 months, or if you're actually struggling to get through a day using it.