There’s no best way to adress this, since it will deppend on the kind of animation/links you have in the project.
I would probably increase the resolution with fixed amounts (e.g doubling)
Then if you haven’t changed you anchors I presume you can scale everything to 50%(if doubled)
you can use an expression if you have animated scales to keep things as they were. (value*.5)
I’m guessing you’ll have to unlink everything before replacing the file, and re-parent afterwards.
good luck