If you use the Battery of your Laptop on a regulary base you should just let it changed or change it yourself.
This is nothing new on this planet and i have changed the Akku in some Laptops (Macbook Pro 2008) up to 3 Times mostly after 2-1/2 to 3 Years.
My MBA M2 Akku is still top notch (97%) because i do not use it so often without AC Plugged.
I Still love to just unplug and still have my Complete Data with me without anything else conected and do not have to sacrifice with 16GB/1TB, this is also very useful when being on Fair´s.
My Lenovo Akku was almost done after 2 Years, with mostly AC plugged in...
Since my MBA M2 is now 3 years old, I have also thought about something new but I don't need it so I will probably wait with a new purchase.
What I was almost more itching to buy is the Mac Mini M4 because you can change the internal hard disk so easily and that is a really cheap snap but I just don't need it so I leave that too.
And the moral of the story is, as always, buy a sensible configuration and you'll get more out of it.
Today i would buy a MBA M4 24GB/1TB.