The FEIN is only required in certain states when a sole proprietorship starts hiring employees.
As a sole proprietor, even if you do not have employees, you can choose to apply for an EIN which you could use to fill forms W-9 instead of using your SSN. Having an EIN does not change your tax filing obligations in any way.
As a sole proprietor, you do not pay yourself and do not issue form 1099-NEC to yourself.
For your information, please read this IRS document about the retirement plans for self-employed people.
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