Remember that a good speaker is essential to any presentation because he or she can direct the audience to the points you want to communicate, in a way that the audience can easily come up with ideas without investing a lot of effort and that's why it's important to get only the best speakers available.
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Obviously you don't just have to pick the keynote speaker you see for the first time because in reality not all the speakers are good there and you are really looking for someone who lives up to your expectations because after all you are paying them a little money and you really don't want to. It's a waste, not to mention that a bad speaker can ruin an entire presentation.
Usually, when looking for the right speaker to speak for your presentation, the first thing to do is research past speeches, pace, personality, style, and other important factors to see if this is the case. suitable for the type of presentation you want to deliver.
If possible, consider any fees you have to pay for the speakers you choose, as some will only charge for the speeches they make during the presentation while others are sure to charge you for speeches, transportation, accommodation, and food. If you are calling from a remote location, it's best if you allocate a sufficient budget so that everything works as expected.
Also consider the entire presentation schedule as some are short and usually finish in one day, some are long, which take days. Therefore, it is best to provide a list of selected speakers, including when to give their speeches so that they can prepare in advance.