How to start a “fictitious” Graphic Design portfolio? Is this a valid idea?

Hey there, I’d like have some suggestions from people into Graphic Design.

So, I’ve studied it in college but it happens I didn’t go further with it professionally.
Now, after 5 years I started thinking twice about evolving in this area.

Guess I gotta get into Adobe softwares again and get more and more experienced.

I want to build a portfolio from zero after that, what kind of works can I do for me to present to some company in the future?
I mean, this works would be “fictitious”, don’t think there are other ways to make this possible.

Other: How are the opportunities on Graphic Design nowadays? Very competitive, there’s work for everyone, (…)?

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