If you loved Girls und Panzer: This Is the Real Anzio Battle!, try Girls und Panzer der Film
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Girls und Panzer: This Is the Real Anzio Battle!

Girls und Panzer der Film
What they share
Both films are directed by Tsutomu Mizushima, and they both carry the playful mood tag, and they sit in Action / Animation / Comedy territory. If that's the register that drew you to Girls und Panzer: This Is the Real Anzio Battle!, the second film will land in a comparable space — through a different lens.
What Girls und Panzer der Film is
Here's a film that really leans into tanks as a school sport. The Ministry of Education reneges on keeping Ooarai Girls Academy open, so Miho and her tankery team must save their Academy Ship. Despite winning the high school tournament, they now face a larger university team. It does deliver exactly what you'd expect.