I will suggest you to participate in online graphic designe contest like logo design, business card design, brochure Design, icon Design contest. You can earn More than $1000 per month if you have great skill in graphic design field.
There are many sites for that as designcrowd, 99designs, freelancer etc.
You can watch this video for more info:
If you need more information about graphic design follow me on YouTube YouTube.com/c/kasturilal
Thanks