welcome aboard agent...500 is actually just their gear score, their level is 30. Level progression from 1 to 30 is pretty fun, storyline is serviceable (nothing groundbreaking)
to progress complete the main missions to level up, do some side missions and settlement projects to level up so that you are near the level requirement of each mission.
once you reach level 30, you have reached end-game and further your progression through world tiers 1 to 5, maxing at gear score 500.

However, a new gear system will be introduced on March 2nd, called Title Update 8.0(TU8) that will increase the gearscore to 515 and introduce a paid expansion called Warlords of New York. TU8 is free to owners of the base game, but the paid-expansion will add new end-game level to 40 with new missions, end game content such as seasons and SHD level progression..u can find out more from their website Warlords of New York

Member of WSS - WhySoSusah [Division PS4]

RM36, is a really worth it...it does not include the expansion...by the time u reach level 30, then you decide to buy the expansion add-on (RM105).