How to increase OVR fast?

Could you please elaborate on some effective strategies to rapidly increase the Overall Rating (OVR) in the context of a game or platform that utilizes such a system? Are there specific actions, such as completing challenges, investing in upgrades, or engaging in multiplayer activities, that tend to yield the most significant boosts in OVR? Additionally, are there any common mistakes to avoid that could hinder the progress towards enhancing one's OVR?