All 32 NFL teams attempt to improve their offense in free agency and the draft, but only a small number make significant strides.
Now, in many cases, that's because the previous unit struggled. The bar needed for perceived improvement with the Carolina Panthers was much lower than, say, the Kansas City Chiefs.
Nevertheless! We're here to applaud some overhauls.
The ranking factors in any players lost before considering the offseason additions. For example, the Los Angeles Chargers substantially improved their offense, but only after trading Keenan Allen, releasing Mike Williams and not re-signing Austin Ekeler.