Fiverr is crap bro. You only use it to gain experience initially. The best way to market your skills is by cold emailing or DMing hundreds of prospects every week. Some will reply, some will not. Most will say no but you just need only 2-3 clients to get converted. This works the best.
Fiverr and Upwork are fine but they eat away a lot of your income and your chances of getting success as a newbie freelancer are less.