The situation hasn't changed from your comment that you posted 5 days ago stating that you need $113,186 of adjusted gross income to have $89,186 taxable income and thus $11,500 tax liability when filing MFJ and using the $24,000 standard deduction. If you only have $90,000 of adjusted gross income, you need another $23,186 of income to get to $113,186.
I have been using MFJ filing status with $24,000 standard deduction and 2 children under the age of 17 in all my calculations (except my first answer). Go to the 2018 tax tables and find $11,500 tax in the MFJ column. See the amount of taxable income for that amount of tax and add $24,000 of standard deduction to arrive at the amount of Adjusted Gross Income you need to have $11,500 of tax liability before credits.
Not sure why you are asking about Additional Child Tax credit. If you have enough tax liability to get $2000 of child tax credit for each of your 2 children, you do not qualify to get any "additional child tax credit". Additional child tax credit is only for tax filers who do not have enough tax liability to get the full $2000 of child tax credit for each child. Here is the link to the 2018 Schedule 8812: <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/f1040s8.pdf">https://www.irs.gov/pub/irs-pdf/f1040s8.pdf</a>
Are you sure that the EV car you bought is eligible for the full $7500 of credit? Not all cars are eligible for that much credit. Here is a source for amount of credit by model. I'm not sure how accurate it is: <a rel="nofollow" target="_blank" href="
https://www.fueleconomy.gov/feg/taxevb.shtml">https://www.fueleconomy.gov/feg/taxevb.shtml</a>
