@JamesFan
The emergency action gave employers the option of allowing employees already enrolled in an FSA to increase their contributions to $10,500 for 2021 only. Either your employer did not offer this option, or you did not take it when offered. In any case, the credit is worth more for 2021 as long as your income is less than $165,000.
For 2022, the tax laws revert back to the laws that were in place for 2020, unless Congress passes a new modification. Under the 2020/2022 rules, the maximum exclusion is $5000. Even if you had contributed $10,500 and managed to carry it all forward, you could only exclude $5000 from your income and the other $5500 would be added back to your taxable income on your 2022 tax return.
