Remove/Delete all things(all objects) after import action into Oracle19c

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We are doing migration works from oracle 11g to Oracle 19c.

1. First export a schema from source DB

2. Create sql script for - table spaces , users ..etc from source db

3. I ran the script into target database

4. Finally I import the dump into target DB and import successfully done with some error, I attached the file.

5. Now we are mock import running , So I want to do the above steps for several times . So Now I need to remove all things done what completed in step 4. How I will remove all items created in step-4 , Then I will run further import action.