Hi to do this:

1. Create a new Python module in your Odoo instance. You can name it task_archive_scheduler or anything you like.

2. In the new module, create a new file named models.py. In this file, define a new class for the task archive scheduler:

   from odoo import models, fields, api
   
   class TaskArchiveScheduler(models.Model):
       _name = 'task.archive.scheduler'
   
       @.model
       def archive_tasks(self):
           Task = self.env['project.task']
           ready_to_archive_tasks = Task.search([('is_ready_to_archive', '=', True)])
           ready_to_archive_tasks.write({'active': False})
   

   In this class, we define a new method archive_tasks which will be called by the scheduled job. This method searches for tasks that are marked as "ready to archive" and archives them by setting the active field to False.

3. Create a new record for the scheduled job. To do this, navigate to Settings > Technical > Automation > Scheduled Actions in Odoo, and create a new record with the following details:

   • Name: Task Archive Scheduler
   • Model: task.archive.scheduler
   • Method: archive_tasks
   • Interval Number: 1
   • Interval Unit: Hours

   This will create a scheduled job that runs every hour and calls the archive_tasks method in the task.archive.scheduler model.

4. Finally, you need to set the is_ready_to_archive field to True for the tasks that you want to be archived. You can do this manually for each task, or you can create a custom button or automation rule to set the field automatically based on some criteria.

Hello 

Please check below link will help you

https://www.cybrosys.com/blog/scheduled-actions-in-odoo-14