When setting out on your own it's that you focus on a few specific types/classes of clients instead of trying to be a general purpose coder for every single kind of organization. The factor for this is easy: if you're always building various types of products then you put yourself in the role of continuously learning brand-new frameworks and acquainting yourself with whatever third-party applications the customer may wish to integrate into the product.
The factor for this is basic - it's scale. If you develop products for a specific type of company then you will definitely need to learn something new for each customer, however this finding out curve will be no place as extreme. This causes greater profits on your end. Let's look at what I indicate.
Because many law firms have similar needs I can usually re-use the very same code base. Given that I charge a flat rate for dev services, I'm collecting my full charge without always having to develop an item from the ground up. If, by contrast, I used these same types of services to every type of service which existed, I would lose the ability to scale up making use of existing code.
Another point about choosing a specific niche is that you end up providing a much, much, much (much) greater level of service to your customers. Did you see this? to the fact that I have extensive experience in serving a narrow class of business, I have the ability to anticipate their requirements and use options they may not otherwise have actually thought about.
So, to put it simply, I have the ability to offer a better product and much better service by focusing on a specific niche. Regrettably, numerous startup designers decide to take whatever work "can be found in the door." This is very bad for their long-term revenues. I simply spelled out why serving a niche increases profits.
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