Retirement tax questions

Thank you. I never received a statutory notice of deficiency. Does this clarify what situation I would be in?:

I recently (April 2019) received a CP2000 for my 2017 tax return because I did not report investment income (a mutual fund transferred to me when I turned 21 (2017). I did not understand how to manage the account at the time and when I did my taxes in TurboTax, I did not enter in the income properly.

Amending my return to reflect the income as investment income kicked me out of qualifying for the EITC. However, this all came after receiving the EITC again for 2018 (I reported my investment income correctly this year). So, I am wondering if there is any way to get on top of all of this and avoid being disallowed from claiming the EITC and potentially returning it for 2018 as well