Are they a Long Term Client?
One of the best ways to increase your income as a freelance writer, while ensuring that you stay busy at all times, is to land long term clients. Of course, this is easier said than done. Everybody wants to find clients that are willing to give them work, month in and month out. As soon as possible, determine if a client will be around for the long haul.
Have you asked? There is nothing wrong with asking your client if they are going to have more work in the future. In fact, they will be glad to hear that you are willing to help them now as well as down the line. Some freelance writers dance around this question, when they should really just come out and ask.
In many cases, you can look at the amount of work you have received in the past in order to find your answer. If you have been working for a client for several months and a slowdown is not imminent, you may have the answer to your question. Of course, firming this up with your client is never a bad idea.
Many clients will tell you up front, before you take on the first project, whether or not they will need your services over the long run. I have found that many clients want to keep you on board for as long as possible because this cuts back on the time they have to spend finding somebody else to work with.
As long as you do good work and continue to look for the right types of clients, you will eventually find those that are willing to keep you around for an extended period of time.