Your Juniors’ application will use tax information from the prior-prior year - so when you fill out the FAFSA in 2024, it will be the tax return for 2022 - not this year.
This year’s tax return will be relevant when filling out the FAFSA for the second year of college.
Also, anything that is not represented on the tax return, such as account balances, will be based on the “as of” date. So, as suggested here, I would make it a priority to speak to a CFA, who is well-informed about college financing, in case there are ways for you to still shelter these funds before they become “year-end balances”.
The next consideration is, whether the college in question requires the CSS profile - which might further limit your options. Per example, non-qualified annuities will have to be reported on the CSS profile.