Hey there,
If you do not know how to create cronjob in local host, you can manually run the cron URL
http://yourSite.com/?option=com_easyblog&task=cron
Before you do so, you can go to function
getAutoAchivingPosts() which is at
JoomlaFolder/administrator/components/com_easyblog/models/blogs.php and change the limit to 50 as shown in the screenshot.
https://take.ms/e415o
So that everytime you run the cron URL, it will get 50 posts that need to be achieved and achieve it.
Take note that you need to enable
Enable Auto Archiving and set
Archive Blog Posts Older Than to 6 months.
https://take.ms/nexRp