The free listing promotions are by invitation only and it seems to be a bit hit and miss which IDs receive them. On this ID we had 4 offers earlier this year and then nothing until the recent 200 free offer for all sellers.

Check that you have ticked the box in your Communication Preferences to receive offers from eBay and regularly check the Promotions section on your All Selling page. The recent 5000 free listings offer was for store subscribers only and only for fixed price listings. If you have a lot of items to sell at a fixed price have you looked at a store subscription?