I think AnnetteB6 is confused about the types of employment that you have. It appears that you have income from self employment and also income from another employer (in which, I assume, you do not have a controlling interest).
Any retirement contributions made on your behalf at your W-2 employer have no bearing on the amount that you are eligible to contribute to a SEP-IRA from your self-employment income. Your maximum SEP contribution for 2019 from self-employment income is 20% of net earnings, or $56,000, whichever is less. Net earnings is net profit minus the deductible portion of self-employment taxes.
