Excel Reader - Datatypes issue when run on loop

So, the Excel reader reads data from an Excel file, checks the first 10,000 rows of data, and sets the data type of the columns accordingly.

Situation:

As you can see in the snapshot above, I am running the Excel reader in a loop with 9 files, and I want the data types of all columns in all 9 files to be set as strings without any manual intervention. These 9 files do not have the same columns; the columns are different in each file.

Please help me with this and reach out if you have a solution or an alternative.