Is there a way to disable the celebrity level for newly generated townie sim?

Hi, My sim is in the hottest spot waiting for the acolade award but I noticed many unlisted celebrity sims were gathering there. I want to delete their all celebrity level and clicked on that sim holding shift key and decreasing the level. B lister got down to notable newcomer and global superstar got down to b lister. That was the lowest I could do. I tried that several times but the level just is stuck on these celebrity levels. I want to entirely disable their level. Is there a way to do that? Thanks.