The Champion Point System is ESOs system to handle progression of characters past level 50. It was introduced in 2015, and is now getting a major overhaul.
The Champion Point cap is being increased from 810 to 3600. XP gains have been sped up to accomodate for the change, but it’s safe to say that it will be a long grind to max CP.
To learn more about the new system check out this blog post on the ESO site.
Champion System 2.0 will be released with Update 29 on March 8th.