Foreign Tax refund – IRS and India

I am a Indian citizen, working in USA.

I filed my US tax return for year 2021 on 15th oct 2022 (i had filed extension for 2021). In the return i claimed a foreign tax credit for taxes paid to India.

Later i filed for refund in India, and got the tax refund from India. I did same for 2022, 2023.

Now it is Sep 2025. Am I too late to file the amended return 1040-X and account for Indian tax refund. I know that usually one can file the 1040-X, but I am unsure how much time one has to do so.

1. How much tax would I have to pay?

2. Would i have to pay any penalty?

3. Can i avoid filing any foreign tax credit in future, since I anyways always get are refund from India.