Shutting down sole proprietorship

I had a schedule C for the last 3 years with one employee. I am no longer operating the business. In fact I paid no wages this year and the business lost money every year (not a huge amount) which is why I decided to shut it down. I have an extension for 2023 taxes. Is there anything I need to do to let the IRS and CA FTB know that I am no longer in business?

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