The Schedule C should only be used to report your business expenses, not any of your income.
Your gains/losses should either be reported on Schedule D and Form 8949 or Form 4797 if you are covered under a Mark-to-Market election.
Take a look at the following TurboTax help article for more information:
How do I report my trader activity with (or without) Section 475(f) election in TurboTax?
@imanuel
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