When you enter into an agreement, you are charged with knowing the terms to that agreement. The renewal clause is there for both your convenience and that of the landlord. The landlord does not want the property to be empty if you leave. If you did not abide by the agreement in extending the term, the landlord had reason to think you did not want to continue, and sought another lessee for the space. Under the facts that you describe, you do not have a winning claim.
If the landlord has already found someone, you are probably out of luck. If the landlord hasn't found someone, approach the landlord in a friendly manner. Explain that you like the space, want to continue, and will be more careful in respecting the terms of the Agreement. It may not work, but taking responsibility for your mistakes is more likely to be a successful strategy than seeking legal relief from a court that you won't get.
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