If you are a collector, search for the "DBD-Raws" or "ReinForce" releases of Season 20. These are remuxes (unaltered video streams) from the Japanese Blu-ray Box. —rare for a TV anime episode—that places you inside the forest. This is the ultimate "high quality" experience.
With these steps, you should be able to find and watch Detective Conan Episode 724 in high quality. Enjoy the episode! detective conan episode 724 high quality
Frequently carries the series, though availability for specific episode blocks like 724 can vary by region. If you are a collector, search for the