We have paragon leveling system after reaching level 100 which is the max level you will have a new feature unlocked.
To use the paragon system you will need to press "C"
and at the top right corner you will see a new button with a head on it
press this button to open the paragon level system
selecting which stat you want to increase place the point by clicking on the stat and click "Apply Changes" at the bottom to save your progress.
The limit of the points per each stat is 255 and max level of these levels is 1020 after that you wont be able to use your points.