One technique for developing a good talk is to know what you’re trying to say, not just for the whole presentation, but for every slide.
And once you’ve done that, you have to know how each slide relates to the one before it, and the one that comes next, so your logic is a clear trail in the mind of the listener.
I think every transition to the next slide can probably be boiled down into a single word, like “Moreover,” “Nevertheless,” “Furthermore,” “In addition,” “In spite of this,” “Strangely enough,” “Sure enough”…we could go on and on.
For instance, I have often started talks with a slide that makes the point that it’s crucial to develop yourself as a speaker to advance as a professional. Then I say, “Lucky enough, it’s entirely possible to learn how to do it.” And then I click to the slide that demonstrates how it’s possible.
There has to be a logical link between one slide and the next, and it would help you and your listeners if you were able to state that link overtly.