Bingo, we have struck the Jackpot .
CleanMyMac aka " BrickMyMac "
Any Third Party Applications that will interfere with the normal operation of the OS, is an invitation for disaster and comprise the Operating System
Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a portion on each sale. What the Application may do to the computer is up to the User to check this out before purchase
Any of the below should be removed as per Developers Instructions
This will include CleanMyMac ,
Read some of the posting and arrive at your own conclusions.
The next part is harsh and may not be welcome news
Specific to CMM ( CleanMyMac )
Some Contributors suggest , this predicated on the Removal of CleanMyMac first , starting in Recovery Mode and choosing to Reinstall the Operating System over the existing installation.
This may or may not replace elements of the Entire Operating System including the Home Folder ( User Account ) and replace any corrupted or removed elements of the Operating System and make thing right.
Then there are Other Contributors ( like myself ) would suggest from this link Use Disk Utility to erase an Intel-based Mac then from this link How to reinstall macOS - Apple Support (CA)
Thereafter to start from scratch and install all Required Application directly from the Apple Apps Store or Directly from the Developer.
If going this route - I suggest Not using Startup Assist to migrate things back as this will probably Re-Introduce the existing issue that existed when the TM Backup was made