You are entitled to a bigger deduction for all the years that you didn't take the depreciation. Unfortunately the IRS does not pay out refunds for anything older than three years.
You can amend your 2021 return to include the depreciation as long as you do so by April 15th. You can also amend your 2022 and 2023 returns.
The IRS requires that you take a depreciation deduction for each year that the property is in service so you will have to figure out the amount of missed depreciation from the 2018, 19 and 20 returns and enter that as accumulated depreciation when you go to the 2021 return.
@elsy-g
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