Incorrect Inventory at EOY

Help! Last year was my first year of selling online. When listing my inventory on 2021 taxes I think I calculated as if it was physically on hand, but was not. I keep very little inventory available as I want most to be online.  I'm trying to finish my extension! for 2022 taxes, but BOY inventory is not correct. How can I rectify to finish 2022 taxes?  Thank you.