Are there any incorrect or missing semicolons?
"I'm a thief I like the challenge of stealing something valuable. We all know; the greatest challenge is the theft of something invaluable. For many years, I searched for my next target, but I failed to find that one right thing which would satisfy my appetite. I don't expect you to understand this need, but I will nevertheless attempt to explain it. I consider myself to be the queen of theft I am more cunning and bold than the others. I have a reputation to uphold; and I intend to do just that.
My search for the perfect object led me on a tour of many famous cities, including: Paris, France; New York, New York; Venice, Italy; and Warsaw, Poland. In none of these places did I find it; I truly began to despair. It's not that there weren't invaluable goods in those locations, but let me be perfectly clear, I am human. Some things are simply too well guarded for even me to consider stealing. Like everything in life, there is a certain balance to strike; I wouldn't unnecessarily risk myself being captured. I do not wish to ever look back and think of how I stole my freedom I do not wish to regret any of the risks I undertook.
I believe I'm painting an appropriate picture of the turmoil that has plagued me. So, you can imagine my exhilaration when I finally found the objects of my dreams. All of the searching worked I finally felt purpose again in my life. My heist would occur in London. I would steal something from the Tower of London; jewels of unfathomable value. I am, of course, talking about the Crown Jewels. This will be the theft of a lifetime; the planning proved to take a lifetime as well.
I understand that no matter how well I've planned this, the chances of getting caught are high. However, I can only plan so much. As this note that I write draws to an end, so too does my planning come to completion I will steal the jewels tonight! I hope that you will not see me captured I hope that you will not see me falter. At the end of the day there are only three people I can blame if I fail; me, myself, and I.
This note will not be seen until the outcome is decided. In this way, there is no opportunity to try and dissuade me. Farewell! "

Yes there are.
“I’m a thief, I like the challenge of stealing something valuable. We all know, the greatest challenge is the theft of something invaluable. For many years I searched for my next target, but I failed to find that one right thing which would satisfy my appetite. I don’t expect you to understand this need; but nevertheless, I will attempt to explain it. I consider myself to be the queen of theft. I am more cunning and bold than others. I have a reputation to uphold; and I intend to do just that.”

- I am only doing the first paragraph right now. Mainly just to show you what you did wrong so you can work on the rest.
- You have to remember that your first choice cannot always be a semicolon. Using a comma will happen more often than a semicolon.
- The way I do it is I read the sentence out loud and if it doesn’t sound smooth as if I would say it like that in a normal conversation, then it needs adjustments.
- A semicolon will only be used if the sentence it’s being used on is a full and proper sentence. That’s why it has a period and a comma. ( ; )

•Incorrect Example: “We all know; the greatest challenge is the theft of something invaluable.”
* “We all know” is not a full sentence, so the semicolon should not come after it at all.

•Correct Example: “I have a reputation to uphold; and I intend to do just that.”

*”I have a reputation to uphold” is a full sentence so it’s allowed here!

-Good job!