These days? Go test some place else. If you made it that far, someplace will give you a shot.
I always interviewed pretty well. As a Sgt, I was senior to a couple really good guys, simply because they didn’t interview and test that well. Everyone agreed they were good cops, and all became good Sgts as well. But it took them extra time to get there.
Meanwhile, we also let thru some real questionable promotions, because that person had a great day, or convinced people that didn’t know them of how great they were, when they were….not.
Point being- don’t take it personal. I had a few interviews early on when trying to get a job where I did not do that well, and as a result was saved from working for what I later found were rinky dink agencies. Always a bright side.