You used an impermissible method of accounting in two or more consecutively filed tax returns as a result of not claiming depreciation deductions and would have to file Form 3115.
See https://www.irs.gov/publications/p946#en_US_2020_publink1000107386
Get assistance from a local tax professional.
See https://taxexperts.naea.org/listing/service/individual-tax-preparation
