I need assistance in compiling a motivational speech on any topic to a general audience

The more motivated by the topic you are the easier it is to motivate others
So pick a topic you are comfortable with that you can convince others of.

For example:
Start introduction and with something the audience can relate to like "Did you ever have one of those days where nothing was going right......" Then go into a topic of easy ways you have found to organize.

Here is a link I found that might help

Motivational Speech Topics