Investors & landlords

Hi,

 

I'm just reading this and makes me worried. I bought a property in 2014 which I have been a renting it out.  I've always hired an accountant to do my tax until 2020. I did my 2019 tax on my own using TurboTax but pretty much followed the same way the accountant had filed for me in the past. Now that I am reading this, I've learned they have never filed any depreciation for me on that property. What's the best I can do now?