Use already available keywords instead of charging 25 credits a week for keywords that already exist

It would be great if the product would look at the keywords that have already been input (In my case it was around 67 keywords) and use those up before charging me 25 credits a week to refresh. If there are 67 keywords in my list and currently I produce 7 articles a week with each article using 1 keyword then it seems to me that I should have about 9 weeks worth of keywords and wouldn’t expect to “refresh” the list until those keywords are used up.