Try replacing the battery. Seems accessible enough at first, but ingenious engineering has made batteries the modern rubik's cube of auto maintenance.
I have a 2009 Citroen and the battery is secured with a bolt that is under the battery compartment and to access it you need to go under the car with a very long wrench, who engineered it is a psycho
Define "modern". I have a 2017 Civic and I've had to replace the battery a couple of times. There's a holding bar that needs to be removed before the battery can be taken out, but other than that the only real problem is the weight of the thing.
My wife had a Chrysler Sebring.
The battery is in a compartment in the left front wheel well. You have to remove that wheel to access the battery.
I was instantly impressed by the pure creativity and artistic expression the team employed for that design.