Did you ever stop to consider who the audience is for your models?
You might build for your own satisfaction. In this case, you can build models of subjects that appeal to you. You can use techniques that you are most familiar with and build to a level of detail and quality that satisfies you.
Then again, if you build in order to display your work, whether for family, friends or other club members, you are going to work to a different set of standards. While your family might share your interests and be pleased with similar subjects, your friends might have a better appreciation of models of topics with which they are more familiar. Club members might be more interested in seeing a model which displays a novel modelling technique or a variation on one of their own subjects.
If entering competitions is the reason you build, you will probably be working with yet another range of subjects and looking to utilize aftermarket parts and additional specialized techniques to make a unique and prize-winning model.
Understanding the audience for which you build will allow you to plan the way you will select a subject and apply the appropriate techniques. This will add to the pleasure you will get from working on the project and result in a more apt model for your audience to view.