Help to merge memory in Samsung Galaxy SM-J500FN

Hello everyone. I'm new and I have a lot to learn ...
I have a Samsung Galaxy SM-J500FN
I have installed Android 6.0.1
I have tried to merge the SD external memory with the internal memory with the ADB program, but it does not.
I have also rooted the J500FN to try to use ADB, but it still does not work.
Is there a way to merge memory without having to load a new ROM?
Putting a new ROM is very complicated and now with increasing memory would be enough.
Thanks for the help.

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