One of the best way to secure tasks regularly at freelance site based on experience I have about it. If you can have a blog and link it to your freelancing profile and always connect your clients when bidding a gig to check out for your latest samples on your blog. That will give them more proof and clear feeling that you can do the task perfectly.The thing is that the testimony that I've gotten from Smosh people that those kids that are on those freelance platforms are for selected standout workers on the platform so it's not everyone that can be getting gigs there you stop there are situations where by just one person is getting almost all the gigs because he is good at what he does.