I will be receiving my social security number for the 1st time soon. I want change my last 3 tax returns so I can get work credit. Can I amend the last 3 years for this?

for the last 3 years while I was going through my immigration process, I was using a ITIN to do my tax returns but I wasn't able to claim work credits for the last 3 years. I am finally getting my SSN in 5-10 days. I want to amend the last 3 tax years so I can claim the work credit. Should I do this or just let it go. I was told I could be losing out on a lot of money