This is a good site and there are many ways to make money on this site. You can offer your services in the for of gigs and also boost them for free. If you get hired then make sure to work as per instructions of clients so that you can get good reviews. If your work is liked by clients then you can get repeat orders as well.
If your work is not liked by clients then you will get bad reviews which is bad for profile. Work hard on this site and try your best as good and bad people are every where. Keep trying and you will start to make money on this site in a short time period. In freelancing there are times when there is a lot of work and there are times when there is no work. Keep applying and trying to get work and you will get work on this site sooner or later.