This is the same problem I am having. I have done all the steps requested here on this post, but still have the shifting. I have read about this on other website forums. The Ender 3v2 's that were bought in the last few months of 2020 seem to be having this problem. I purchased mine in November 2020.
The only way I can print without layer shift is to prop open the mainboard case to allow for better airflow to cool the mainboard.