Hi @Raksha125 ,
Please follow the steps below to achieve the same:
1. Navigate to the module "Export Definition" and create an entry against the table for which you would like to export data from. Also define which attribute you would like to export from the selected table as shown below:

2. Now, navigate to an module named "Export Target" and create an entry as shown below:

3. Now, navigate to an module named "Export Set" and create an entry as shown below:

4. Now finally create a scheduled Export entry using the module "Scheduled Export Set" where you can specify the condition to make this run on 16th of every month and fetch only records created between 1st and 15th of that month as shown below:

Hope this helps. Please mark the answer as correct/helpful based on impact.
Regards,
Shloke