The solution to landing more jobs is not losing more jobs.
Once you get a customer it is up to you and only you to keep that customer. The competition will not take a happy customer from you. If you give the customer a reason to leave they will take it, don't give them a reason, instead show them the reasons they should stay. Maintain the effort you exerted in getting them, to keeping them, and the competition will be a thing someone else will be concerned with.
Many here blame other cut throat practices for the reason they suffer. I look at what I can do better, period. There is no other way.