@Critter-3 is correct; you need to file Form 3115 in order to properly rectify this situation.
See https://www.irs.gov/publications/p946#en_US_2020_publink1000107386
This form is rather complex and requires professional intervention. If you want to try and go the DIY route, then you will basically have to take your chances as you will have entered the audit lottery.
