Yes: the main way to improve is deliberate practice.

A useful exercise is to restrict yourself to portrait orientation for a session or project, just as photographers often limit themselves to one lens or one subject to build skill. Shoot familiar subjects both ways and compare the results.

It also helps to review your existing images carefully. Ask what elements strengthen the picture and what distracts from it. Cropping or masking parts of an image can show whether a vertical composition would have been cleaner or more effective. Over time, this trains you to notice clutter and frame more selectively in-camera.

Study composition in other photographers’ work too. Look at how they arrange lines, shapes, and negative space in vertical frames, then compare that to your own images.

As a rule of thumb, portrait orientation often works well for tall or vertically structured subjects such as people, architecture, and some abstract details, while landscape orientation often suits wider scenes. But either orientation can work for almost any subject, so experimenting is important.

In short: shoot more verticals, review them critically, and study strong examples.