Fiverr can take your skills and business to the sky for a really short time.
Personally, I seek services on Fiverr almost weekly, some of which are: copywriting, design, SEO and Business Proposals.
From some of the gigs I am really sattisfied, I may return and offer chunky part of work which is for a decent fee for the person that will do the work for me. Unfortunately, if you are a single person - the work will be a lot in the beginning and you will work for peanut and will take at least a year of building your portfolio to raise your fees.
Probably it is possible to earn over the average salary in the first year but you will always need to work really hard and will not get any easier at all.
Not many people can pass the first stage which is building a profile and get more gigs. In the beginning, when you open a profile you will struggle to find clients - but once you build over 10–50 successful orders - new clients will start approaching you really organically.