Under-contributed to Dependent Care FSA for 2021, can I deduct the rest from my taxable income?

My company has open enrollment in May and I set up a Dependent Care FSA of $5000 (as it was allowed at that time). It was then converted into monthly contribution of just over 400  bucks a month. Now it's the end of the the year, my contribution to the FSA is just over $2000 for the 2021, that's much less than the actual limit of $10500 for the year (married filing jointly). Our actual daycare expense for 2021 is about 15K. Now I understand that I can reimburse for the $2000 something that I already contributed (through payroll deduction). My question is: Can I claim the remaining amount (10500 minus the 2000 something I already contributed) and deduct that amount from my taxable income? Or I'm stuck with the 2000 something in my FSA?