Could you provide a comprehensive guide filled with actionable strategies, best practices, and innovative techniques on how to meticulously structure a speech that is expected to span over a specific duration of [LENGTH OF TIME]? The speech is intended for a [TOPIC] and it should adhere to a [FORMAL/INFORMAL] tone, depending on the context and the nature of the event. Moreover, it should be designed in a way that caters effectively to the preferences, expectations, and interests of our [TARGET AUDIENCE]. Could you also incorporate elements that would ensure audience engagement, retention and inspire them to take the desired action?

How can I improve my delivery while giving a [TYPE OF PRESENTATION] to a [SPECIFIC TYPE OF AUDIENCE], considering my [VOICE/SPEECH] is [FAST/SLOW] and I tend to [UMM/AHH] a lot?

What are some effective ways to grab the [TARGET AUDIENCE]'s attention during a speech about [TOPIC] that is [LENGTH OF TIME] long and takes place in a [FORMAL/INFORMAL] setting?

Can you provide some tips on how to overcome [SPECIFIC FEAR/ANXIETY] while speaking in front of a [LARGE/SMALL] audience, considering my [AGE/GENDER] and [LEVEL OF EXPERIENCE] in public speaking?

What are some common mistakes to avoid while giving a speech on [TOPIC] that is [LENGTH OF TIME] long, intended for a [SPECIFIC TYPE OF AUDIENCE], and requires the use of [VISUAL AIDS/PROPS]?