You can update the value last_generated in the table acym_campaing in your database.
Make sure you edit the column only for the right campaign, to do it check the ID of your campaign in the AcyMailing listing.
The column needs to be set with a timestamp, for example, the timestamp of when I wrote this message is 1613471092
If you trigger the campaign every week on Monday, you will have to set the timestamp for the 15 February (yesterday)
Here is the value to put: 1613381205
Here is a website to get a specific timestamp: https://www.unixtimestamp.com/