Hi @Anonymous ,
This is the basic structure of a flow to do what you are after.
1) Get Items and specify to order by Created and limit to 400 items
2) For each returned item, you will need to create it again in the new list
3) Delete the returned item that was just recreated
4) Rinse and repeat in the loop

--------------------------------------------------------------------------
If I have answered your question, please mark my post as a solution
If you have found my response helpful, please give it a thumbs up
Connect on LinkedIn