It sounds like you are not closing your business. ".....want to close my business and just enjoy it as a hobby."
If you generate any income from the "hobby" business it may be a reportable transaction (on your income tax return). If you have a hobby.. you can only deduct expenses up to the amount of income (so you can not have a "loss" that reduces your tax liability).
Also, while you may consider it a hobby, the IRS may not.... check IRS regs
If you are incorporated, and want to change to a sole proprietorship there are some legal steps to take to dissolve the corporation (and disburse the assets, if any).
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