Graphic Design Forums
If you have not yet taken the step to doing paid work or have thought about it, I suggest that you pick 1 or perhaps 2 design tools, practice so that you are comfortable with the tools that you can make a variety of things, you can always stick to what you are good at but it is helpful to know your way around the software you are using quickly. If there are things that you do not know about it may be beneficial for you to expand your knowledge. It is very possible to earn money from your GFX designs kills, especially on fiverr.
Designers are always in demand, there are plenty of people who build websites, games, apps, software they all need gfx designers, anyone who has a facebook page that they want to better reflect their business they want gfx designers, bands want them for posters, so you will always have work to do!
Build a portfolio of free work that you can show off as examples, be clear especially on fiverr as to what you can and can’t do, otherwise you’ll be wasting your time.