I understand what you're desiring to do here. But the chances of it getting you audited are extremely high, and you would most likely lose in the audit. The fines and penalties with the IRS, combined with the fines and penalties for contributions to a tax deferred retirement plan that money did not qualify you to contribute to, would be financially devastating to you. Any hope of a comfortable retirement would be gone then.
With only one rental property, if you are not in the real estate business already as your primary source of income, thus qualifying as a real estate professional, then there's no way this is self-employment income, by any stretch unfortunately.
Now it's possible that if you convert the property from long term residential rental, to short term rental property (such as VRBO or AirB&B) you might be able to meet the requirements for that to qualify as a SCH C business. But you should seek the services of a tax professional on just what the requirements are, before making any such decision. Of course, doing this will not in any way change your 2020 or earlier tax returns.
