Love this series, where is the rest?

This series is awesome, but where is the rest of the series? The narrators are awesome, and OMG Granny (LOL). The banter is so entertaining and funny. I just purchased book 4 after years and the rest of the series is still not on audible. There are some triggers so reader beware. Well worth the credit even though I don’t usually purchase short books but wanted more of the series. I hope Jodi Vaughn finishes the series on audible, but after years doesn’t seem likely, so if you start this series know that it’s been years since other books are on Audible.