battery keeps dying

Disconnect one of the battery connectors.

Be sure all electrical devices / lights are off. doors are closed.

Measure from the disconnrcted battery terminal to the battery post it came off of. If it reads 12 volts or really any volts other than 0 you have whats called a paridetic load.

To find the culprit, do the same test but disconnect one fuse at a time, if the voltage goes to 0 when a fuse is pulled thats the cir to start tracing.

There are other devices that are not fused so you might have to disconnect lightbulbs or other devices one at a time and check.

Question.

How many times do you start the car?
How long do you drive the car after each start?
Have you checked that the alternator is actually charging the battery?