How many years of experience do you have? I ask this because you are still studying, right?
If you have so much experience and have worked for several successful businesses, why is your portfolio empty? If you are a graphic designer, your portfolio should have examples, of course, of your work.
Focus on what you are excellent at, for more skills, create specialized profiles. Do not send proposals until you create a good profile. In "new to Upwork" you have a post posted at the beginning that you must read, everything, links included. Now your profile is nothing.