First, I'd suggest concentrating on one blog for the time being. Post to it every day and try to make connections with other bloggers. A great way to do this is by participating in something like the Ultimate Blog Challenge (http://ultimateblogchallenge.com/).

Second, if you got hired with London Broker, get started! Read their directions carefully and don't be afraid to put all the time you need into doing the article the way they want it. With time you'll get faster. If you aren't getting enough work with them try another company like The Content Authority (http://thecontentauthority.com/), which always has work. Set a goal of how many articles you'd like to write a day or how much money you'd like to write a day and don't stop until you have done them.

Once you are meeting those goals start trying to get some private clients. Content companies will only get you so far!

Good luck!