The first thing you should do is to start with your planning a bit in advance. If you take this step right away you will be amazed how your PowerPoint presentation skills will improve. In order to follow this advice you do not need to be a professional designer.
Your PowerPoint presentation should be started with advance planning. Nowadays the way of life is so fast and that is why many PowerPoint presenters complain that they do not have enough time for proper planning. That is why they skip their planning and this is one of the biggest mistakes they can do. In such a case what they usually do is they just grab few PowerPoint slides from one deck and few slides from another one. Most probably their colleagues have already used those PowerPoint slides.
Do you think it is possible to form a clear message in such a way? Acting like this your target audience will never understand the main message and will not be motivated to act on it. In most cases, the final result turns out very bad. That is why you should do your best to prepare and plan everything in advance for your next upcoming PowerPoint presentation.