If you have created your template with Template Creator CK into Joomla 3, the template will not work with Joomla 4, in particular because of the overrides.It also depends with which version of Template Creator CK you created it. Anyway there are simple steps that you can follow to update your template and continue to use it for Joomla 4.
How to update the template version
Go in Template Creator CK >> edit your template >> Page >> Informations >> Joomla version >> select Joomla 4, and regenerate the template using the Copy / Apply changes button
The best method would be to make a copy of the Joomla 3 template in Template Creator CK and rename it for J4, so you have the old template running on J3 and the new on J4, there is only the template selection toggle to do in Joomla when your migration is done.
So now with only 4 clicks, you can use your template into Joomla 4. If you have any issue with the migration process, you can ask on the forum